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Direction (Q. Nos. 11 and 12) This section contains a paragraph, wach describing theory, experiments, data etc. three Questions related to paragraph have been given.Each question have only one correct answer among the four given ptions (a),(b),(c),(d)Photoelectric effect can be expressed in terms of the following graph
Q. What is work function for this photoelectric emission of electrons?- a)199.262 kJ mol-1
- b)199.262 J mol-1
- c)3.3 kJ mol-1
- d)3.3 x 10-19 kJ mol-1
Correct answer is option 'A'. Can you explain this answer?
Direction (Q. Nos. 11 and 12) This section contains a paragraph, wach describing theory, experiments, data etc. three Questions related to paragraph have been given.Each question have only one correct answer among the four given ptions (a),(b),(c),(d)
Photoelectric effect can be expressed in terms of the following graph
Q. What is work function for this photoelectric emission of electrons?
a)
199.262 kJ mol-1
b)
199.262 J mol-1
c)
3.3 kJ mol-1
d)
3.3 x 10-19 kJ mol-1
|
Gaurav Kumar answered |
Photoelectric effect is represented by
IMF द्वारा क्रय शक्ति समता की गणना के लिए आमतौर पर किस पद्धति का उपयोग किया जाता है?
- a)सकल राष्ट्रीय उत्पाद
- b)शुद्ध घरेलू उत्पाद
- c)सकल राष्ट्रीय उत्पाद
- d)सकल घरेलु उत्पाद
Correct answer is option 'A'. Can you explain this answer?
IMF द्वारा क्रय शक्ति समता की गणना के लिए आमतौर पर किस पद्धति का उपयोग किया जाता है?
a)
सकल राष्ट्रीय उत्पाद
b)
शुद्ध घरेलू उत्पाद
c)
सकल राष्ट्रीय उत्पाद
d)
सकल घरेलु उत्पाद
|
Pranjal Mukherjee answered |
Method used by IMF to calculate purchasing power parity
The International Monetary Fund (IMF) uses the method of Gross Domestic Product (GDP) at Purchasing Power Parity (PPP) to calculate purchasing power parity. This method involves comparing the prices of goods and services in different countries to determine the relative value of currencies.
Explanation
Purchasing power parity is a measure of the economic productivity of a country that takes into account the differences in prices between countries. It is used to compare the standard of living of different countries by calculating the amount of goods and services that can be purchased with a given amount of money.
The method used by the IMF to calculate PPP involves the following steps:
1. Comparing prices: The prices of a basket of goods and services are compared between different countries. This basket of goods includes food, clothing, housing, and other consumer goods.
2. Measuring currency exchange rates: The exchange rates between currencies are measured to determine the relative value of currencies.
3. Calculating GDP: The GDP of each country is calculated based on the prices of the basket of goods and services and the exchange rates.
4. Adjusting for inflation: The GDP figures are adjusted for inflation to ensure that the prices of goods and services remain constant over time.
5. Comparing GDP: The GDP figures are then compared between countries to determine the purchasing power parity.
Conclusion
The method used by the IMF to calculate purchasing power parity is a useful tool for comparing the standard of living between countries. It takes into account the differences in prices and exchange rates and provides a more accurate picture of the relative value of currencies.
The International Monetary Fund (IMF) uses the method of Gross Domestic Product (GDP) at Purchasing Power Parity (PPP) to calculate purchasing power parity. This method involves comparing the prices of goods and services in different countries to determine the relative value of currencies.
Explanation
Purchasing power parity is a measure of the economic productivity of a country that takes into account the differences in prices between countries. It is used to compare the standard of living of different countries by calculating the amount of goods and services that can be purchased with a given amount of money.
The method used by the IMF to calculate PPP involves the following steps:
1. Comparing prices: The prices of a basket of goods and services are compared between different countries. This basket of goods includes food, clothing, housing, and other consumer goods.
2. Measuring currency exchange rates: The exchange rates between currencies are measured to determine the relative value of currencies.
3. Calculating GDP: The GDP of each country is calculated based on the prices of the basket of goods and services and the exchange rates.
4. Adjusting for inflation: The GDP figures are adjusted for inflation to ensure that the prices of goods and services remain constant over time.
5. Comparing GDP: The GDP figures are then compared between countries to determine the purchasing power parity.
Conclusion
The method used by the IMF to calculate purchasing power parity is a useful tool for comparing the standard of living between countries. It takes into account the differences in prices and exchange rates and provides a more accurate picture of the relative value of currencies.
The position of both, an electron and a helium atom is known within 1.0 mm. Further more the momentum of the electron is known within 5.0 x 10-26 kg ms-1. The minimum uncertainty in the measurement of the momentum of the helium atom is- a)50.0 kg ms-1
- b)80.0 kg ms-1
- c)80.0 x 10-26 kg ms-1
- d)5.0 x 10-26 kg ms-1
Correct answer is option 'D'. Can you explain this answer?
The position of both, an electron and a helium atom is known within 1.0 mm. Further more the momentum of the electron is known within 5.0 x 10-26 kg ms-1. The minimum uncertainty in the measurement of the momentum of the helium atom is
a)
50.0 kg ms-1
b)
80.0 kg ms-1
c)
80.0 x 10-26 kg ms-1
d)
5.0 x 10-26 kg ms-1
|
Nabanita Singh answered |
Given,
Position of both an electron and a Helium atom = 1 nm
The momentum of an electron =
Uncertainty principle: It is defined as the position and the momentum both can not be determined simultaneously.
According to the Uncertainty principle,
h = Planck`s constant
When the position of an electron and helium atom is the same and the momentum of an electron is known then the momentum of the helium atom is equal to the momentum of an electron.
Therefore, the momentum of the Helium atom is 5.0 x 10-26 kg ms-1
Can you explain the answer of this question below:The threshold frequency v0 for a metal is 7.0 x 1014 s-1. Radiation of frequency v = 1.0 x 1015 s-1 hits the metal. Kinetic energy of the emitted electron is
- A:
2.0 x 10-18 J
- B:
1.60 x 10-17 J
- C:
1.60 x 10-19 J
- D:
2.0 x 10-19 J
The answer is d.
The threshold frequency v0 for a metal is 7.0 x 1014 s-1. Radiation of frequency v = 1.0 x 1015 s-1 hits the metal. Kinetic energy of the emitted electron is
2.0 x 10-18 J
1.60 x 10-17 J
1.60 x 10-19 J
2.0 x 10-19 J
|
Suresh Reddy answered |
By photoelectric effect
Photoelectric effect can be expressed in terms of the following graph
Q. Kinetic energy imparted to the moving electron at a wavelength of 2.5 x 10-7 m is- a)-278.97 kJ mol-1
- b)278.97 kJmol-1
- c)168.23 kJmol-1
- d)-168.23 kJ mol-1
Correct answer is option 'B'. Can you explain this answer?
Photoelectric effect can be expressed in terms of the following graph
Q. Kinetic energy imparted to the moving electron at a wavelength of 2.5 x 10-7 m is
a)
-278.97 kJ mol-1
b)
278.97 kJmol-1
c)
168.23 kJmol-1
d)
-168.23 kJ mol-1
|
Pioneer Academy answered |
Photoelectric effect is represented by
Statement I : It is impossible to determine position and momentum of the moving electron simultaneously with same accuracy.Statement II : The path of an electron in an atom is clearly defined.- a)Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
- b)Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I
- c)Statement I is correct but Statement II is incorrect
- d)Statement II is correct but Statement I is incorrect
Correct answer is option 'C'. Can you explain this answer?
Statement I : It is impossible to determine position and momentum of the moving electron simultaneously with same accuracy.
Statement II : The path of an electron in an atom is clearly defined.
a)
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I
b)
Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I
c)
Statement I is correct but Statement II is incorrect
d)
Statement II is correct but Statement I is incorrect
|
Neha Joshi answered |
Statement 1 is uncertainty principle, according to which we can't locate a moving electron accurately at any instant, which implies there must me certain uncertainty in its path, as path basically gives us the position of electron at various instances.
Identify the plans shown in figure and select correct option.
A
(a) Sphagnum
(b) Selaginella
(c) Selsginella
(d) Cycas
B
(a) Dictyota
(b) Ginkgo
(c) Salvinia
(d) Ginkgo- a)a
- b)b
- c)c
- d)d
Correct answer is option 'B'. Can you explain this answer?
Identify the plans shown in figure and select correct option.
A
(a) Sphagnum
(b) Selaginella
(c) Selsginella
(d) Cycas
B
(a) Dictyota
(b) Ginkgo
(c) Salvinia
(d) Ginkgo
A
(a) Sphagnum
(b) Selaginella
(c) Selsginella
(d) Cycas
B
(a) Dictyota
(b) Ginkgo
(c) Salvinia
(d) Ginkgo
a)
a
b)
b
c)
c
d)
d
|
Vivek Patel answered |
Plants given in the figure are A- Selaginella and B-Ginkgo respectively. Selaginella is a trailing, hanging or erect evergreen lycopod(Pteridophyte).
Ginkgo biloba(a Gymnosperm) has not changed for the last several millions of years since its appearance in triassic period. It is also called living fossil. The plant has survived due to interest shown by horticulturists. It has natural immunity to several plant diseases.
Ginkgo biloba(a Gymnosperm) has not changed for the last several millions of years since its appearance in triassic period. It is also called living fossil. The plant has survived due to interest shown by horticulturists. It has natural immunity to several plant diseases.
Frequency of a matter wave is equal to- a)
- b)
- c)
- d)
Correct answer is option 'B'. Can you explain this answer?
Frequency of a matter wave is equal to
a)
b)
c)
d)
|
Chirag Verma answered |
By de-Broglie equation
If the photon of the wavelength 150 pm strikes an atom and one of its inner bound electrons is ejected out with a velocity of 1.5 x 107 ms-1, then binding energy by which electron is bound to nucleus is- a)1.223 x10-15 J
- b)-1.223x 10-15 J
- c)2.345 x10-15 J
- d)1.428 x10-15 J
Correct answer is option 'B'. Can you explain this answer?
If the photon of the wavelength 150 pm strikes an atom and one of its inner bound electrons is ejected out with a velocity of 1.5 x 107 ms-1, then binding energy by which electron is bound to nucleus is
a)
1.223 x10-15 J
b)
-1.223x 10-15 J
c)
2.345 x10-15 J
d)
1.428 x10-15 J
|
|
Shreya Gupta answered |
The spread of living pteridophytes is limited and is restricted to narrow geographical region because of - a)gametophytic growth needs cool, damp and shady places
- b)requirement of water for fertilization
- c)absence of stomata in leaf and absence of vascular tissue
- d)both (a) and (b)
Correct answer is option 'D'. Can you explain this answer?
The spread of living pteridophytes is limited and is restricted to narrow geographical region because of
a)
gametophytic growth needs cool, damp and shady places
b)
requirement of water for fertilization
c)
absence of stomata in leaf and absence of vascular tissue
d)
both (a) and (b)
|
|
Aditi Datta answered |
Introduction:
The spread of living pteridophytes is limited and restricted to narrow geographical regions due to certain requirements and limitations in their growth and reproduction. The correct answer is option 'D', which states that the spread of living pteridophytes is limited due to the need for cool, damp, and shady places for gametophytic growth, as well as the requirement of water for fertilization. Let's delve into the details of each of these factors.
Explanation:
Gametophytic growth needs cool, damp, and shady places:
- The gametophytic phase of pteridophytes is an independent, free-living phase where fertilization occurs.
- The gametophytes of pteridophytes require a suitable environment to grow and reproduce.
- Cool, damp, and shady places provide the necessary conditions for the survival and growth of gametophytes.
- These conditions ensure sufficient moisture and protection from direct sunlight, which can be detrimental to gametophytic growth.
- Therefore, the spread of living pteridophytes is limited to regions that offer such environments, restricting their geographical distribution.
Requirement of water for fertilization:
- Pteridophytes are non-flowering plants, and their reproductive process involves the need for water for fertilization.
- The male gametes (sperm) are flagellated and require water to swim to the female gametes (eggs) for fertilization.
- This water-dependent mode of fertilization restricts the dispersal of pteridophyte species.
- Pteridophytes cannot reproduce in dry environments or areas lacking sufficient water bodies.
- Therefore, the geographical spread of living pteridophytes is limited to regions with abundant water sources, such as near rivers, streams, or damp habitats.
Conclusion:
The limited spread of living pteridophytes is primarily due to the requirement of cool, damp, and shady places for gametophytic growth and the necessity of water for fertilization. These factors restrict their geographical distribution and confine them to specific regions that offer suitable environmental conditions for their survival and reproduction.
The spread of living pteridophytes is limited and restricted to narrow geographical regions due to certain requirements and limitations in their growth and reproduction. The correct answer is option 'D', which states that the spread of living pteridophytes is limited due to the need for cool, damp, and shady places for gametophytic growth, as well as the requirement of water for fertilization. Let's delve into the details of each of these factors.
Explanation:
Gametophytic growth needs cool, damp, and shady places:
- The gametophytic phase of pteridophytes is an independent, free-living phase where fertilization occurs.
- The gametophytes of pteridophytes require a suitable environment to grow and reproduce.
- Cool, damp, and shady places provide the necessary conditions for the survival and growth of gametophytes.
- These conditions ensure sufficient moisture and protection from direct sunlight, which can be detrimental to gametophytic growth.
- Therefore, the spread of living pteridophytes is limited to regions that offer such environments, restricting their geographical distribution.
Requirement of water for fertilization:
- Pteridophytes are non-flowering plants, and their reproductive process involves the need for water for fertilization.
- The male gametes (sperm) are flagellated and require water to swim to the female gametes (eggs) for fertilization.
- This water-dependent mode of fertilization restricts the dispersal of pteridophyte species.
- Pteridophytes cannot reproduce in dry environments or areas lacking sufficient water bodies.
- Therefore, the geographical spread of living pteridophytes is limited to regions with abundant water sources, such as near rivers, streams, or damp habitats.
Conclusion:
The limited spread of living pteridophytes is primarily due to the requirement of cool, damp, and shady places for gametophytic growth and the necessity of water for fertilization. These factors restrict their geographical distribution and confine them to specific regions that offer suitable environmental conditions for their survival and reproduction.
The given diagram shows:
- a)An alga that lacks flagellated cells
- b)A liverwort
- c) A heterosporous pteridophyte
- d)A gymnosperm with non motile sperms
Correct answer is option 'C'. Can you explain this answer?
The given diagram shows:
a)
An alga that lacks flagellated cells
b)
A liverwort
c)
A heterosporous pteridophyte
d)
A gymnosperm with non motile sperms
|
Ambition Institute answered |
Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and micro (small) spores, are known as heterosporous. The megaspores and microspores germinate and give rise to female and male gametophytes, respectively
A heterosporous pteridophyte
SALVINIA
SALVINIA
The direction cosines of
are - a)1, 1, 1
- b)2, 2, 2
- c)1/√2, 1/√2, 1/√2
- d)1/√3, 1/√3, 1/√3
Correct answer is option 'D'. Can you explain this answer?
The direction cosines ofare
are a)
1, 1, 1
b)
2, 2, 2
c)
1/√2, 1/√2, 1/√2
d)
1/√3, 1/√3, 1/√3
|
Lavanya Menon answered |
Let
= 
∴ Ax = 1, Ay = 1, Az = 1
and
cos α, cos β andcos y are the direction cosines of.
= ∴ Ax = 1, Ay = 1, Az = 1and
cos α, cos β andcos y are the direction cosines of
.The leaves in pteridophyta are small (microphylls) as in ________or large (macrophylls) as in _________.- a)Selaginella, ferns
- b)ferns,Selaginella
- c)Selaginella, equisetum
- d)salvinia, equisetum
Correct answer is option 'A'. Can you explain this answer?
The leaves in pteridophyta are small (microphylls) as in ________or large (macrophylls) as in _________.
a)
Selaginella, ferns
b)
ferns,Selaginella
c)
Selaginella, equisetum
d)
salvinia, equisetum
|
Stepway Academy answered |
The leaves in pteridophyta are small (microphylls) as in Selaginella or large (macrophylls) as in ferns. The sporophytes bear sporangia that are subtended by leaf-like appendages called sporophylls.
Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.Which of the following properties of atom could be explained correctly by Thomson Model of atom?- a)Overall neutrality of atom.
- b)Spectra of hydrogen atom.
- c)Position of electrons, protons and neutrons in atom.
- d)Stability of atom.
Correct answer is option 'A'. Can you explain this answer?
Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Which of the following properties of atom could be explained correctly by Thomson Model of atom?
a)
Overall neutrality of atom.
b)
Spectra of hydrogen atom.
c)
Position of electrons, protons and neutrons in atom.
d)
Stability of atom.
|
Anjana Sharma answered |
According to Thomson model of atom, the mass of the atom is assumed to be uniformly distributed over the atom. This model was able to explain the overall neutrality of the atom.
Assertion (A): The development of zygotes into young embryos takes place within the female gametophytes.
Reason (R): This event is a precursor to the seed habit, considered an important step in evolution- a)Both A and R are true, and R is the correct explanation of A.
- b)Both A and R are true, but R is not the correct explanation of A
- c)A is true, but R is false.
- d)A is false, but R is true
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): The development of zygotes into young embryos takes place within the female gametophytes.
Reason (R): This event is a precursor to the seed habit, considered an important step in evolution
Reason (R): This event is a precursor to the seed habit, considered an important step in evolution
a)
Both A and R are true, and R is the correct explanation of A.
b)
Both A and R are true, but R is not the correct explanation of A
c)
A is true, but R is false.
d)
A is false, but R is true
|
|
Stepway Academy answered |
Solution:
Correct answer: 1. Both A and R are true, and R is the correct explanation of A.
Correct answer: 1. Both A and R are true, and R is the correct explanation of A.
Explanation: The development of the zygote within the female gametophyte provides protection and nourishment to the embryo, which is a key evolutionary step leading to the development of seeds in higher plants. Thus, both the assertion and reason are true, and the reason correctly explains the assertion.
Line in NCERT: "The development of the zygotes into young embryos take place within the female gametophytes. This event is a precursor to the seed habit considered an important step in evolution."
Gametophyte in the pteridophytes(i) Small, inconspicuous.
(ii) unicellular.
(iii) Mostly photosynthetic thalloid
(iv) need water for fertilisationHow many statements are correct with respect to gametophyte?- a) Two
- b)Three
- c)Four
- d)One
Correct answer is option 'B'. Can you explain this answer?
Gametophyte in the pteridophytes
(i) Small, inconspicuous.
(ii) unicellular.
(iii) Mostly photosynthetic thalloid
(iv) need water for fertilisation
(ii) unicellular.
(iii) Mostly photosynthetic thalloid
(iv) need water for fertilisation
How many statements are correct with respect to gametophyte?
a)
Two
b)
Three
c)
Four
d)
One
|
Infinity Academy answered |
The correct answer is B: Three.
The spores germinate to give rise to inconspicuous, small but multicellular, free-living, mostly photosynthetic thalloid gametophytes called prothallus. These gametophytes require cool, damp, shady places to grow. Because of this specific restricted requirement and the need for water for fertilisation, the spread of living pteridophytes is limited and restricted to narrow geographical regions.
Therefore, three statements are correct regarding the gametophyte in pteridophytes.
The spores germinate to give rise to inconspicuous, small but multicellular, free-living, mostly photosynthetic thalloid gametophytes called prothallus. These gametophytes require cool, damp, shady places to grow. Because of this specific restricted requirement and the need for water for fertilisation, the spread of living pteridophytes is limited and restricted to narrow geographical regions.
Therefore, three statements are correct regarding the gametophyte in pteridophytes.
देश के सकल घरेलू उत्पाद के निम्नलिखित कथनों पर विचार करें:(i) सकल राष्ट्रीय उत्पाद एक देश की जीडीपी है जिसे विदेशों से आय के साथ जोड़ा जाता है।(ii) जीएनपी हमेशा अपने जीडीपी से कम होता है।(iii) भारत में, जीएनपी हमेशा अपने जीडीपी से अधिक हैइनमें से कौन सा कथन सही है?- a)केवल 1
- b)केवल 1 और 3
- c)केवल 1 और 2
- d)ऊपर के सभी
Correct answer is option 'A'. Can you explain this answer?
देश के सकल घरेलू उत्पाद के निम्नलिखित कथनों पर विचार करें:
(i) सकल राष्ट्रीय उत्पाद एक देश की जीडीपी है जिसे विदेशों से आय के साथ जोड़ा जाता है।
(ii) जीएनपी हमेशा अपने जीडीपी से कम होता है।
(iii) भारत में, जीएनपी हमेशा अपने जीडीपी से अधिक है
इनमें से कौन सा कथन सही है?
a)
केवल 1
b)
केवल 1 और 3
c)
केवल 1 और 2
d)
ऊपर के सभी
|
Pranav Shah answered |
Gross Domestic Product (GDP) and Gross National Product (GNP) are both important measures of a country's economic performance. In this question, we are asked to identify the correct relationship between GDP and GNP.
1. GDP:
GDP is the total value of all goods and services produced within a country's borders during a specific period, usually a year. It is calculated by adding up the value of consumer spending, government spending, investment, and net exports (exports minus imports). GDP represents the economic output of a country and is commonly used to measure its overall economic health.
2. GNP:
GNP, on the other hand, is the total value of all goods and services produced by a country's residents, whether within the country or abroad, during a specific period. GNP includes the income earned by a country's residents from their investments and work abroad. It also takes into account the income earned by foreign residents within the country. GNP provides a broader view of a country's economic performance as it includes both domestic and international economic activities involving its residents.
3. Relationship between GDP and GNP:
Based on the definitions of GDP and GNP, it is clear that GNP includes GDP as a component. This is because GNP takes into account the income earned by a country's residents from their investments and work abroad, which is already included in GDP. Therefore, we can say that GDP is a subset of GNP.
Answer: a) 1
In conclusion, GDP is a measure of the total value of goods and services produced within a country's borders, while GNP takes into account the income earned by a country's residents from their investments and work abroad. Since GNP includes GDP as a component, the correct relationship between GDP and GNP is that GDP is a subset of GNP.
1. GDP:
GDP is the total value of all goods and services produced within a country's borders during a specific period, usually a year. It is calculated by adding up the value of consumer spending, government spending, investment, and net exports (exports minus imports). GDP represents the economic output of a country and is commonly used to measure its overall economic health.
2. GNP:
GNP, on the other hand, is the total value of all goods and services produced by a country's residents, whether within the country or abroad, during a specific period. GNP includes the income earned by a country's residents from their investments and work abroad. It also takes into account the income earned by foreign residents within the country. GNP provides a broader view of a country's economic performance as it includes both domestic and international economic activities involving its residents.
3. Relationship between GDP and GNP:
Based on the definitions of GDP and GNP, it is clear that GNP includes GDP as a component. This is because GNP takes into account the income earned by a country's residents from their investments and work abroad, which is already included in GDP. Therefore, we can say that GDP is a subset of GNP.
Answer: a) 1
In conclusion, GDP is a measure of the total value of goods and services produced within a country's borders, while GNP takes into account the income earned by a country's residents from their investments and work abroad. Since GNP includes GDP as a component, the correct relationship between GDP and GNP is that GDP is a subset of GNP.
Wavelength associated with an electron having KE 3.0 x 10-25 J is x *10-7 m.Q. What is the value of x? (Round of to nearest integer)Correct answer is '9'. Can you explain this answer?
Wavelength associated with an electron having KE 3.0 x 10-25 J is x *10-7 m.
Q. What is the value of x? (Round of to nearest integer)
|
|
Ashish Chaudhary answered |
Understanding the Problem
To find the wavelength of an electron with a given kinetic energy (KE), we will use the de Broglie wavelength formula. The kinetic energy is provided as 3.0 x 10-25 J.
De Broglie Wavelength Formula
The de Broglie wavelength (λ) is given by the equation:
- λ = h / p
Where:
- h is Planck's constant (6.626 x 10-34 J·s)
- p is the momentum of the electron, which can be calculated using:
- p = sqrt(2 * m * KE)
Here, m is the mass of the electron (approximately 9.11 x 10-31 kg).
Calculating the Momentum
- Substitute the known values:
- KE = 3.0 x 10-25 J
- m = 9.11 x 10-31 kg
- Calculate p:
- p = sqrt(2 * 9.11 x 10-31 kg * 3.0 x 10-25 J)
Calculating the Wavelength
- Now substitute p back into the de Broglie formula:
- λ = h / p
- Substitute h = 6.626 x 10-34 J·s and the calculated momentum to find λ.
Final Calculation and Conversion
- After performing the calculations, you will find that λ is approximately 9 x 10-7 m when expressed in the desired format (x x 10-7 m).
Conclusion
Thus, the value of x is 9, confirming that the wavelength associated with the electron having a KE of 3.0 x 10-25 J is indeed 9 x 10-7 m.
To find the wavelength of an electron with a given kinetic energy (KE), we will use the de Broglie wavelength formula. The kinetic energy is provided as 3.0 x 10-25 J.
De Broglie Wavelength Formula
The de Broglie wavelength (λ) is given by the equation:
- λ = h / p
Where:
- h is Planck's constant (6.626 x 10-34 J·s)
- p is the momentum of the electron, which can be calculated using:
- p = sqrt(2 * m * KE)
Here, m is the mass of the electron (approximately 9.11 x 10-31 kg).
Calculating the Momentum
- Substitute the known values:
- KE = 3.0 x 10-25 J
- m = 9.11 x 10-31 kg
- Calculate p:
- p = sqrt(2 * 9.11 x 10-31 kg * 3.0 x 10-25 J)
Calculating the Wavelength
- Now substitute p back into the de Broglie formula:
- λ = h / p
- Substitute h = 6.626 x 10-34 J·s and the calculated momentum to find λ.
Final Calculation and Conversion
- After performing the calculations, you will find that λ is approximately 9 x 10-7 m when expressed in the desired format (x x 10-7 m).
Conclusion
Thus, the value of x is 9, confirming that the wavelength associated with the electron having a KE of 3.0 x 10-25 J is indeed 9 x 10-7 m.
Which of the following rules/principles is responsible to rule out the existence of definite paths or trajectories of electrons?- a)Aufbau (ascending energy) rule
- b)Hund’s rule of maximum multiples
- c)Pauli’s exclusion principle
- d)Heisenberg’s uncertainty principle
Correct answer is option 'D'. Can you explain this answer?
Which of the following rules/principles is responsible to rule out the existence of definite paths or trajectories of electrons?
a)
Aufbau (ascending energy) rule
b)
Hund’s rule of maximum multiples
c)
Pauli’s exclusion principle
d)
Heisenberg’s uncertainty principle
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Anjana Sharma answered |
According to Heisenberg’s uncertainty principle, the position and velocity of an electron cannot be determined simultaneously with accuracy which rules out the existence of fixed paths.
If n is a unit vector in the direction of the vector 
then
- a)
- b)
- c)
- d)
Correct answer is option 'A'. Can you explain this answer?
If n is a unit vector in the direction of the vector then
thena)
b)
c)
d)
|
Mira Joshi answered |
Unit vector is vector with magnitude unity but having specific direction.
Value of unit vector is given by:
Where,
= unit vectorA = vector a
∣A∣ = magnitude of vector a
Pick the correct group consisting of all genera exhibiting homospory.- a)Lycopodium, Psilotum, Selaginella, Equisetum
- b)Equisetum, Pteris, Salvinia, Psilotum
- c)Salvinia, Pteris, Lycopodium, Selaginella
- d)Equisetum, Psilotum, Lycopodium, Pteris
Correct answer is option 'D'. Can you explain this answer?
Pick the correct group consisting of all genera exhibiting homospory.
a)
Lycopodium, Psilotum, Selaginella, Equisetum
b)
Equisetum, Pteris, Salvinia, Psilotum
c)
Salvinia, Pteris, Lycopodium, Selaginella
d)
Equisetum, Psilotum, Lycopodium, Pteris
|
Top Rankers answered |
The correct group consisting of all genera exhibiting homospory is:
Option D Equisetum, Psilotum, Lycopodium, Pteris
These genera are known to exhibit homospory, where they produce a single type of spore.
Identify the parts labelled A and B in the given figure of Equisetum and select the correct option.
(A)
(a) Strobilus
(b) Sporophylls
(c) Sporangia
(d) Sporophyte
(B)
(a) Rhizome
(b) Tuber
(c) Rhizome
(d) Tuber- a)a
- b)b
- c)c
- d)d
Correct answer is option 'A'. Can you explain this answer?
Identify the parts labelled A and B in the given figure of Equisetum and select the correct option.
(A)
(a) Strobilus
(b) Sporophylls
(c) Sporangia
(d) Sporophyte
(B)
(a) Rhizome
(b) Tuber
(c) Rhizome
(d) Tuber
(A)
(a) Strobilus
(b) Sporophylls
(c) Sporangia
(d) Sporophyte
(B)
(a) Rhizome
(b) Tuber
(c) Rhizome
(d) Tuber
a)
a
b)
b
c)
c
d)
d
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Vivek Patel answered |
In Equisetum plant body is differentiated into stem, leaves and roots. Adventitious roots develop in whorls over the nodes of rhizome. Aerial branches develop terminal strobili. In E. arvense, there are two types of aerial branches, green sterile and brown fertile. Terminal strobili occur only on fertile branches.
If a vector makes angles α, β and γ with X, Y and Z axes respectively then sin2α + sin2β + sin2γ is equal to - a)0
- b)1
- c)2
- d)3
Correct answer is option 'C'. Can you explain this answer?
If a vector makes angles α, β and γ with X, Y and Z axes respectively then sin2α + sin2β + sin2γ is equal to
makes angles α, β and γ with X, Y and Z axes respectively then sin2α + sin2β + sin2γ is equal to a)
0
b)
1
c)
2
d)
3
|
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Suresh Iyer answered |
cos2 α + cos2 β + cos2 Y = 1
(1 - sin2 α) + (1 - sin2 β) + (1 - sin2 Y) = 1
or sin2 α + sin2 β + sin2 Y = 3 - 1 = 2
(1 - sin2 α) + (1 - sin2 β) + (1 - sin2 Y) = 1
or sin2 α + sin2 β + sin2 Y = 3 - 1 = 2
Direction (Q. Nos. 13) Choice the correct combination of elements and column I and coloumn II are given as option (a), (b), (c) and (d), out of which ONE option is correct.Q. Neon gas is generally used in sign boards. It emits radiations at wavelength 616 nm.
Match the values derived given in Column II with the corresponding parameter given in Column I.
- a)a
- b)b
- c)c
- d)d
Correct answer is option 'B'. Can you explain this answer?
Direction (Q. Nos. 13) Choice the correct combination of elements and column I and coloumn II are given as option (a), (b), (c) and (d), out of which ONE option is correct.
Q.
Neon gas is generally used in sign boards. It emits radiations at wavelength 616 nm.
Match the values derived given in Column II with the corresponding parameter given in Column I.
Match the values derived given in Column II with the corresponding parameter given in Column I.
a)
a
b)
b
c)
c
d)
d
|
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Abhijeet Chauhan answered |
Direction (Q. Nos. 14 - 16) This section contains 2 questions. when worked out will result in an integer from 0 to 9 (both inclusive)Q. The work function (
) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal i s ........
Correct answer is '4'. Can you explain this answer?
Direction (Q. Nos. 14 - 16) This section contains 2 questions. when worked out will result in an integer from 0 to 9 (both inclusive)
Q.
The work function () of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal i s ........
) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal i s ........
|
Akshay Sharma answered |
Thus, any metal with energy less than 4.14 eV will emit photons thus, showing photoelectric effect. (Li, Na, K, Mg)
In an atom, an electron is moving with a speed of 600 ms-1 with an accuracy of 0.005%. Certainty with which the position of the electron can be located is
[AIEEE2009]- a)1.52x 10-4 m
- b)5.10 x 10-3 m
- c)1.92 x 10-3 m
- d)3.84 x 10-3 m
Correct answer is option 'C'. Can you explain this answer?
In an atom, an electron is moving with a speed of 600 ms-1 with an accuracy of 0.005%. Certainty with which the position of the electron can be located is
[AIEEE2009]
a)
1.52x 10-4 m
b)
5.10 x 10-3 m
c)
1.92 x 10-3 m
d)
3.84 x 10-3 m
|
Nilesh Saini answered |
The components of Vector 
along the directions of vectors (
) is- a)1/√2
- b)- 1/√2
- c)1/2
- d)-1/2
Correct answer is option 'B'. Can you explain this answer?
The components of Vector along the directions of vectors () is
along the directions of vectors () isa)
1/√2
b)
- 1/√2
c)
1/2
d)
-1/2
|
|
Suresh Iyer answered |
Given 
, (say) components of along the direction of 
, (say) components of along the direction of Chapter doubts & questions for May Week 4 - Weekly Tests for NEET Preparation 2025 is part of NEET exam preparation. The chapters have been prepared according to the NEET exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for NEET 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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