Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 48 - 51 of 64

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Question number: 48

» Thermodynamic and Statistical Physics » Bose-Einstein Condensation

Appeared in Year: 2011

MCQ▾

Question

Consider an ideal Bose gas in three dimensions with the energy – momentum relation with . The range of for which this system may undergo a Bose – Einstein condensation at a non- zero temperature is – (June)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 49

» 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: 50

» 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.

Question number: 51

» Thermodynamic and Statistical Physics » Fermi Gases

Appeared in Year: 2011

MCQ▾

Question

The energy levels of electrons of mass ‘m’ and charge ‘e’ confined in an area A in the xy – plane with a uniform magnetic field B applied in the z – direction are given by the degeneracy of each level is . The lowest level is completely filled and the others are empty. The Fermi energy , where, N is the total number of electrons, is – (December)

Choices

Choice (4) Response

a.

Coincident with the level

b.

Midway between the and the levels

c.

Midway between the and the levels

d.

Coincident with the level

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