Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 40 - 43 of 64

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Question number: 40

» Thermodynamic and Statistical Physics » Blackbody Radiation

Appeared in Year: 2012

MCQ▾

Question

Consider black body radiation contained in a cavity whose walls are at temperature T. The radiation is in equilibrium with the walls of the cavity. If the temperature of the walls is increased to 2T and the radiation is allowed to come to equilibrium at the new temperature, the entropy of the radiation increases by a factor of (June)

Choices

Choice (4) Response

a.

8

b.

16

c.

4

d.

2

Question number: 41

» Thermodynamic and Statistical Physics » Bose-Einstein Condensation

Appeared in Year: 2012

MCQ▾

Question

Bose condensation occurs in liquid Equation kept at ambient pressure at Equation . At which temperature will Bose condensation occur in Equation in gaseous state, the density of which is 1000 times smaller than that of liquid Equation ?

(Assume that it is a perfect Bose gas) (June)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 42

» Thermodynamic and Statistical Physics » Bose-Einstein Condensation

Appeared in Year: 2012

MCQ▾

Question

Non – interacting boson undergo Bose – Einstein Condensation (BEC) when trapped in a three – dimensional isotropic simple harmonic potential. For BEC to occur, the chemical potential must be equal to –

(December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

0

d.

Equation

Question number: 43

» Thermodynamic and Statistical Physics » Laws of Thermodynamics

Appeared in Year: 2012

MCQ▾

Question

A given quantity of gas is taken from the state Equation reversibly, by two paths, Equation directly and Equation as shown in the figure below.

PV diagram of cycle ABC

PV Diagram of Cycle ABC

In PV diagram of ABC cycle is shown.

During the process Equation the work done by the gas is 100 J and the heat absorbed is Equation . If during the process Equation the work done by the gas is Equation , the heat absorbed is – (December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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