Thermodynamic and Statistical Physics-Free Energy (CSIR Physical Sciences): Questions 8 - 9 of 9

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Question number: 8

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2011

MCQ▾

Question

Gas molecules of mass ‘m’ are confined in a cylinder of radius R and height L (With R > > L) kept vertically in the Earth’s gravitational field. The average energy of the gas at low temperature (such that mgLkBT ) is given by, (December)

Choices

Choice (4) Response

a.

2NkBT

b.

NkBT2

c.

3NkBT2

d.

5NkBT2

Question number: 9

» 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

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