Class 9 Exam > Class 9 Questions > Direction: In the following questions, a sta...
Start Learning for Free
Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Bohr’s orbits are called stationary orbits.
Reason : Electrons remain stationary in these orbits for sometime.
- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
Correct answer is option 'C'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Direction: In the following questions, a statement of assertion (A) i...
Electrons in different orbits have fixed energies.
View all questions of this test
Most Upvoted Answer
Direction: In the following questions, a statement of assertion (A) i...
Assertion: Bohr’s orbits are called stationary orbits.
Reason: Electrons remain stationary in these orbits for sometime.
The correct answer is option 'C', which states that assertion (A) is true but reason (R) is false.
Explanation:
Bohr's model of the atom proposed by Niels Bohr in 1913 is based on the concept of stationary orbits. According to this model, electrons revolve around the nucleus in specific energy levels or orbits, similar to the way planets revolve around the Sun. These orbits are also known as stationary orbits because electrons do not emit or absorb energy while moving in these orbits.
However, the reason given in statement (R), which states that electrons remain stationary in these orbits for some time, is incorrect. In reality, electrons do not remain stationary in these orbits. They continuously move around the nucleus in a circular path, maintaining a certain distance from the nucleus.
The stationary orbits in Bohr's model are quantized, meaning that electrons can only occupy specific energy levels. These energy levels are determined by the principal quantum number (n), which represents the shell or energy level of the electron. Electrons can transition between different energy levels by absorbing or emitting energy in the form of photons.
The reason why electrons do not collapse into the nucleus while moving in these orbits is due to the balance between the centripetal force and the electrostatic force of attraction between the negatively charged electrons and the positively charged nucleus. The centripetal force provides the necessary force to keep the electrons in their orbits.
In conclusion, Bohr's orbits are called stationary orbits because electrons do not emit or absorb energy while moving in these orbits. However, electrons do not remain stationary in these orbits, and the reason given in statement (R) is incorrect.
Reason: Electrons remain stationary in these orbits for sometime.
The correct answer is option 'C', which states that assertion (A) is true but reason (R) is false.
Explanation:
Bohr's model of the atom proposed by Niels Bohr in 1913 is based on the concept of stationary orbits. According to this model, electrons revolve around the nucleus in specific energy levels or orbits, similar to the way planets revolve around the Sun. These orbits are also known as stationary orbits because electrons do not emit or absorb energy while moving in these orbits.
However, the reason given in statement (R), which states that electrons remain stationary in these orbits for some time, is incorrect. In reality, electrons do not remain stationary in these orbits. They continuously move around the nucleus in a circular path, maintaining a certain distance from the nucleus.
The stationary orbits in Bohr's model are quantized, meaning that electrons can only occupy specific energy levels. These energy levels are determined by the principal quantum number (n), which represents the shell or energy level of the electron. Electrons can transition between different energy levels by absorbing or emitting energy in the form of photons.
The reason why electrons do not collapse into the nucleus while moving in these orbits is due to the balance between the centripetal force and the electrostatic force of attraction between the negatively charged electrons and the positively charged nucleus. The centripetal force provides the necessary force to keep the electrons in their orbits.
In conclusion, Bohr's orbits are called stationary orbits because electrons do not emit or absorb energy while moving in these orbits. However, electrons do not remain stationary in these orbits, and the reason given in statement (R) is incorrect.
Attention Class 9 Students!
To make sure you are not studying endlessly, EduRev has designed Class 9 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 9.
|
Explore Courses for Class 9 exam
|
|
Similar Class 9 Doubts
Top Courses for Class 9View all
Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer?
Question Description
Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer?.
Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer?.
Solutions for Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 9.
Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free.
Here you can find the meaning of Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer?, a detailed solution for Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Bohr’s orbits are called stationary orbits.Reason : Electrons remain stationary in these orbits for sometime.a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).c)Assertion (A) is true but reason (R) is false.d)Assertion (A) is false but reason (R) is true.Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Class 9 tests.
|
|
Explore Courses for Class 9 exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup