Thermodynamics and Statistical Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 60 - 62 of 82

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Question 60

Thermodynamics and Statistical Physics

Appeared in Year: 2008

Question

MCQ▾

Two identical particles have to be distributed among three energy levels. Let and represent the ratio of probability of finding two particles to that of finding one particle in a given energy state. The subscripts and correspond to whether the particles are bosons, fermions and classical particles, respectively. Then is equal to –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 61

Thermodynamics and Statistical Physics

Appeared in Year: 2007

Question

MCQ▾

The free energy for a photon gas is given by , where is a constant. The entropy and the pressure of the photon gas are –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 62

Thermodynamics and Statistical Physics

Appeared in Year: 2008

Question

MCQ▾

The pressure versus temperature diagram of a given system at certain low temperature range is found to be parallel to the temperature axis in the liquid – to – solid transition region. The change in the specific volume remains constant in this region. The conclusion one can get from the above is –

Choices

Choice (4)Response

a.

The change in entropy is zero in the liquid – to – solid transition region.

b.

The entropy decreases when the system transform from liquid to solid phase in this region of temperature.

c.

The entropy of solid is zero in this temperature region

d.

The entropy increases when the system goes from liquid to solid phase in this temperature region.

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