Thermodynamic and Statistical Physics (CSIR Physical Sciences): Questions 47 - 49 of 56

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Question number: 47

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2011

MCQ▾

Question

Assume that the free energy of a magnetic system has an expansion in the order parameter M of the form F(M,T)=a(TTC)M2+bM4+cM6 , with a,bandc>0 . As the temperature is lowered below TC , the system undergoes a phase transition. The behaviour of the order parameter just below the transition, where (TTC) is very small, is best described by – (December)

Choices

Choice (4) Response

a.

M(TCT)3

b.

M(TCT)12

c.

M(TCT)

d.

M(TCT)12

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 εps with s>0 . The range of s for which this system may undergo a Bose – Einstein condensation at a non- zero temperature is – (June)

Choices

Choice (4) Response

a.

0<s<2

b.

1<s<3

c.

0<s<

d.

0<s<3

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 0,2εand4ε . The average energy per particle of the gas, when βε1 , is – (December)

Choices

Choice (4) Response

a.

ε

b.

2ε3

c.

2ε

d.

3ε

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