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Origin Of Quantum Mechanics NAT Level – 1 - IIT JAM MCQ


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10 Questions MCQ Test - Origin Of Quantum Mechanics NAT Level – 1

Origin Of Quantum Mechanics NAT Level – 1 for IIT JAM 2024 is part of IIT JAM preparation. The Origin Of Quantum Mechanics NAT Level – 1 questions and answers have been prepared according to the IIT JAM exam syllabus.The Origin Of Quantum Mechanics NAT Level – 1 MCQs are made for IIT JAM 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Origin Of Quantum Mechanics NAT Level – 1 below.
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*Answer can only contain numeric values
Origin Of Quantum Mechanics NAT Level – 1 - Question 1

An X-ray tube operating at 50kV converts 1%  energy in the form of X-ray. If the amount of heat produced is 495 watts, then the number of electrons colliding with the target per second is  . Find the value of α.


Detailed Solution for Origin Of Quantum Mechanics NAT Level – 1 - Question 1

Number of electrons colliding with the target per second is :

The correct answer is: 6.25

*Answer can only contain numeric values
Origin Of Quantum Mechanics NAT Level – 1 - Question 2

In a hydrogen atom following Bohr's postulates, the product of linear momentum and angular momentum is proportional to (n)x where n is the orbit number. Then x is


Detailed Solution for Origin Of Quantum Mechanics NAT Level – 1 - Question 2

Linear momentum ⇒ 
Angular momentum ⇒ 
∴  Product of linear momentum and angular momentum ∝ n0.

The correct answer is: 0

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*Answer can only contain numeric values
Origin Of Quantum Mechanics NAT Level – 1 - Question 3

Work function for aluminum metal is  4.125 eV.  For photo electric effect from aluminum metal, the cut off wavelength (in nm) will be.


Detailed Solution for Origin Of Quantum Mechanics NAT Level – 1 - Question 3

The correct answer is: 300

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Origin Of Quantum Mechanics NAT Level – 1 - Question 4

If the short wavelength limit of the continuous spectrum coming out of a coolidge tube is 10Å, then the de-Broglie wavelength (in Å)of the electrons reaching the largest metal in the coolidge tube is approximately.


Detailed Solution for Origin Of Quantum Mechanics NAT Level – 1 - Question 4

 
The correct answer is: 0.3

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Origin Of Quantum Mechanics NAT Level – 1 - Question 5

Yellow light of 557 nm wavelength is incident on a cesium surface. It is found that no photo-electron flow in the circuit when the cathode anode voltage drops below 0.25V. Then the threshold wavelength (in nm) for photoelectric effect from cesium is.


Detailed Solution for Origin Of Quantum Mechanics NAT Level – 1 - Question 5


⇒ 
The correct answer is: 625

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Origin Of Quantum Mechanics NAT Level – 1 - Question 6

Light of wavelength 5000Å falls on a sensitive plate with photoelectric work function of 1.9 eV. The kinetic energy (in eV) of the emitted photo-electron will be.


Detailed Solution for Origin Of Quantum Mechanics NAT Level – 1 - Question 6

The correct answer is: 0.58

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Origin Of Quantum Mechanics NAT Level – 1 - Question 7

The ratio of de-Broglie wavelength of a proton and an α-particle accelerated through the same potential difference is:


Detailed Solution for Origin Of Quantum Mechanics NAT Level – 1 - Question 7


 

⇒  
The correct answer is: 2.828

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Origin Of Quantum Mechanics NAT Level – 1 - Question 8

When light of intensity 1 W/m2 and wavelength 5 × 10–7 m is incident on a surface, it is completely absorbed by the surface. If 100 photons emit one electron and area of the surface is 1 cm2, then the photoelectric current (in µA) will be.


Detailed Solution for Origin Of Quantum Mechanics NAT Level – 1 - Question 8

Number of photon/second 
Number of photon electron emitted/second by 1 photon = N/100
Photo electric current  
The correct answer is: 0.4

*Answer can only contain numeric values
Origin Of Quantum Mechanics NAT Level – 1 - Question 9

The wavelength of Ln line in X-rays spectrum of 78Pt is 1.32 Å. The wavelength of Ln line in X-rays spectrum of another unknown element is 4.17Å. If screening constant for La line is 7.4, then atomic number of the unknown element is :


Detailed Solution for Origin Of Quantum Mechanics NAT Level – 1 - Question 9



The correct answer is: 47

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Origin Of Quantum Mechanics NAT Level – 1 - Question 10

The intensity of an X-ray beam reduces to 36.8% of its initial intensity after traversing a gold film of thickness 5 × 10–3 m. Its absorption coefficient (in m–1) is :


Detailed Solution for Origin Of Quantum Mechanics NAT Level – 1 - Question 10

The correct answer is: 200

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