CSIR Physical Sciences: Questions 106 - 109 of 389

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Question number: 106

» Thermodynamic and Statistical Physics » Planck's Distribution Law

Appeared in Year: 2014

MCQ▾

Question

A system can have three energy levels: E=0,±ε . The level E=0 is doubly degenerate, while the others are non-degenerate. The average energy at inverse temperature β is – (June)

Choices

Choice (4) Response
a.

εtanh(βε)

b.

εtanh(βε2)

c.

ε(eβεeβε)(1+eβε+eβε)

d.

zero

Question number: 107

» Electromagnetic Theory » Reflection and Refraction

Appeared in Year: 2011

MCQ▾

Question

In a Young’s double slit interference experiment, the slits are at a distance 2L from each other and the screen is at a distance D from the slits. If a glass slab of refractive index μ and thickness d is placed in the path of one of the beams, the minimum value of d for the central fringe to be dark is – (December)

Choices

Choice (4) Response
a.

λD(μ1)L

b.

λ2(μ1)

c.

λμ1

d.

λD(μ1)D2+L2

Question number: 108

» Quantum Mechanics » Commutators and Heisenberg Uncertainty Principle

Appeared in Year: 2012

MCQ▾

Question

The commutator [x2,p2] is – (June)

Choices

Choice (4) Response
a.

2i(xp+px)

b.

2ipx

c.

2ix(xppx)

d.

2ixp

Question number: 109

» Classical Mechanics » Dynamical System

Appeared in Year: 2014

MCQ▾

Question

The radius of Earth is approximately 6400 km. The height h at which the acceleration due to Earth’s gravity differs from g at the Earth’s surface by approximately 1 % is – (December)

Choices

Choice (4) Response
a.

48 km

b.

16 km

c.

32 km

d.

64 km

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