Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 45 - 47 of 64

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Question number: 45

» 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 ) is given by, (December)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 46

» Thermodynamic and Statistical Physics » Classical and Quantum Statistics

Appeared in Year: 2011

MCQ▾

Question

Consider a system of N non – interacting spins, each of which has classical magnetic moment of magnitude . The Hamiltonian of this system in an external magnetic field is

where is the magnetic moment of the spin. The magnetization per spin at temperature T is: (June)

Choices

Choice (4) Response

a.

b.

c.

d.

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 , with . As the temperature is lowered below , the system undergoes a phase transition. The behaviour of the order parameter just below the transition, where is very small, is best described by – (December)

Choices

Choice (4) Response

a.

b.

c.

d.

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