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Quantum Mechanics In Three Dimensions NAT - Physics MCQ


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10 Questions MCQ Test Topic wise Tests for IIT JAM Physics - Quantum Mechanics In Three Dimensions NAT

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

A stone with mass 1kg is whirled in a horizontal circle of radius 1m with a period of revolution equal to 1s. What value of orbital angular momentum quantum no. l describes this motion? (in 1034)


Detailed Solution for Quantum Mechanics In Three Dimensions NAT - Question 1

The speed of the stone in its orbit is

Angular momentum = mvr = 1kg × 6.28 m/s × 1m
= 6.28 kg m2/s

For classical objects the quantum numbers are excessively big

The correct answer is: 5.96

*Answer can only contain numeric values
Quantum Mechanics In Three Dimensions NAT - Question 2

Calculate the minimum value of for the stone mentioned in problem 4.


Detailed Solution for Quantum Mechanics In Three Dimensions NAT - Question 2


The correct answer is: 0.9964

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*Answer can only contain numeric values
Quantum Mechanics In Three Dimensions NAT - Question 3

Calculate the average distance of an electron from the nucleus in the ground state of hydrogen atom is unit of a0.


Detailed Solution for Quantum Mechanics In Three Dimensions NAT - Question 3


The correct answer is: 1.5

*Answer can only contain numeric values
Quantum Mechanics In Three Dimensions NAT - Question 4

Find the level of degeneracy for particle in a 3d box with energy 


Detailed Solution for Quantum Mechanics In Three Dimensions NAT - Question 4


level of degeneracy = 6
The correct answer is: 6

*Answer can only contain numeric values
Quantum Mechanics In Three Dimensions NAT - Question 5

Find the value of the normalisation constant in the unit  of that normalizes the ground state wavefunction of the particle in a box of lengths L, 2L, 3L in  x, y and z directions respectively. Take  √3 = 1.732


Detailed Solution for Quantum Mechanics In Three Dimensions NAT - Question 5

The probability density  Integration over the volume of the cube must be unity






The correct answer is: 1.15

*Answer can only contain numeric values
Quantum Mechanics In Three Dimensions NAT - Question 6

Find the level of degeneracy for a 3 dimensional isotropic quantum harmonic oscillator of energy 


Detailed Solution for Quantum Mechanics In Three Dimensions NAT - Question 6



(0, 0, 8) 3 states
(2, 2, 4) 3 states
(3, 3, 2) 3 states
(1, 1, 6) 3 states
(4, 4, 0) 3 states
=  3 × 5 = 15 states
Rest will give 6 states each
(0, 1, 7)(1, 2, 5)(4, 1, 3)(2, 0, 6)(0, 3, 5)
6 × 5 = 30
Total = 15 + 30 = 45 states
The correct answer is: 45

*Answer can only contain numeric values
Quantum Mechanics In Three Dimensions NAT - Question 7

Consider two harmonic oscillators in 3 dimensions. For what ratio of angular frequencies will the first excited state of one oscillator have energy twice that of the second oscillator’s third excited state energy i.e find 


Detailed Solution for Quantum Mechanics In Three Dimensions NAT - Question 7




The correct answer is: 3.6

*Answer can only contain numeric values
Quantum Mechanics In Three Dimensions NAT - Question 8

Modeling a defect trap in a crystal as a 3d box with edge length 5Å, find the values of energy for an electron bound to the defect site, assuming the electron to be in the ground state. (in eV)


Detailed Solution for Quantum Mechanics In Three Dimensions NAT - Question 8


= 0.0716 × 10-68 + 31 + 20
= 0.0714 × 10-17 Joules
= 0.0447 × 102 eV
= 4.5 eV
The correct answer is: 4.5

*Answer can only contain numeric values
Quantum Mechanics In Three Dimensions NAT - Question 9

Find the probability of finding a particle in a 3d box of length L, in the volume 

(Assume the particle to be in the ground state).


Detailed Solution for Quantum Mechanics In Three Dimensions NAT - Question 9




= 0.04
The correct answer is: 0.04

*Answer can only contain numeric values
Quantum Mechanics In Three Dimensions NAT - Question 10

Calculate the probability that the electron in the ground state of hydrogen will be found outside the first Bohr radius in the unit e–2. Take


Detailed Solution for Quantum Mechanics In Three Dimensions NAT - Question 10

The probability is found by integrating the radial probability density for this state from  a0  to ∞.


The correct answer is: 5

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