CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 350 - 352 of 463

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Question number: 350

» Quantum Mechanics » Timeindependent Perturbation Theory and Applications

Appeared in Year: 2012

MCQ▾

Question

Consider an electron in a box of length L with periodic boundary condition . If the electron is in the with energy , what is the correction to its energy, to second order of perturbation theory, when it is subjected to weak periodic potential , where is an integral multiple of the ? (June)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 351

» Thermodynamic and Statistical Physics » Brownian Motion

Appeared in Year: 2011

MCQ▾

Question

A gas of N non- interacting particles is in thermal equilibrium at temperature T. Each particle can be in any of the possible non – degenerate state of energy . The average energy per particle of the gas, when , is – (December)

Choices

Choice (4) Response

a.

ε

b.

c.

d.

Question number: 352

» Thermodynamic and Statistical Physics » Maxwell Relations

Appeared in Year: 2012

MCQ▾

Question

The energy required to create a lattice vacancy in a crystal is equal to . The ratio of the number densities of vacancies , when crystal is equilibrium at 1200 K and 300 K, respectively, is approximately, (June)

Choices

Choice (4) Response

a.

b.

c.

d.

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