Thermodynamics and Statistical Physics (GATE Physics): Questions 10 - 13 of 37

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Question number: 10

» Thermodynamics and Statistical Physics » Degenerate Fermi Gas

Appeared in Year: 2015

Short Answer Question▾

Write in Short

Given that the Fermi energy of gold is 5.54eV , the number density of electrons is ________ ×1028m3 (up to one decimal place)

(Mass of electron =9.11×1031kg;h=6.626×1034Js;1eV=1.6×1019J )

Question number: 11

» Thermodynamics and Statistical Physics » Free Energy

Appeared in Year: 2016

MCQ▾

Question

For a system at constant temperature and volume, which of the following statements is correct at equilibrium?

Choices

Choice (4) Response
a.

The Gibbs free energy attains a local minimum.

b.

The Helmholtz free energy attains a local minimum.

c.

The Helmholtz free energy attains a local maximum.

d.

The Gibbs free energy attains a local maximum.

Question number: 12

» Thermodynamics and Statistical Physics » Black-Body Radiation and Planck's Distribution Law

Appeared in Year: 2015

MCQ▾

Question

For a black body radiation in a cavity, photons are created and annihilated freely as a result of emission and absorption by the walls of the cavity. This is because –

Choices

Choice (4) Response
a.

Photons are spin – 1 particle

b.

The chemical potential of the photons is zero

c.

Photons obey Pauli exclusion principle

d.

The entropy of the photons is very large.

Question number: 13

» Thermodynamics and Statistical Physics » Bose-Einstein Condensation

Appeared in Year: 2015

MCQ▾

Question

In Bose – Einstein condensates, the particles –

Choices

Choice (4) Response
a.

Have overlapping wave functions

b.

Condense in real space

c.

Have large and positive chemical potential

d.

Have strong inter – particle attraction

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