# Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 29 - 32 of 64

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## Question number: 29

» Thermodynamic and Statistical Physics » Blackbody Radiation

Appeared in Year: 2011

MCQ▾

### Question

A cavity contains blackbody radiation in equilibrium at temperature T. The specific heat per unit volume of the photon gas in the cavity is of the form , where is a constant. The cavity is expanded to twice its original volume and then allowed to equilibrate at the same temperature T. The new internal energy per unit volume is – (June)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 30

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2013

MCQ▾

### Question

If the energy dispersion of a two – dimensional electron system is , where is the velocity and k is the momentum, then the density of states depends on the energy as, (June)

### Choices

Choice (4) Response

a.

b.

Constant

c.

d.

E

## Question number: 31

» Thermodynamic and Statistical Physics » Thermodynamic Potentials

Appeared in Year: 2014

MCQ▾

### Question

A Carnot cycle operates as a heat engine between two bodies of equal heat capacity until their temperature become equal. If the initial temperature of the bodies are and , respectively, and , then their common final temperature is – (Dec– 2013)

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 32

» Thermodynamic and Statistical Physics » Random Walk

Appeared in Year: 2014

MCQ▾

### Question

In one dimension, a random walker takes a step with equal probability to the left or right. What is the probability that the walker returns to the starting point after 4 steps? (June – 2014)

### Choices

Choice (4) Response

a.

b.

c.

d.

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