Thermodynamic and Statistical Physics (CSIR Physical Sciences): Questions 53 - 55 of 56

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Question number: 53

» Thermodynamic and Statistical Physics » Ising Model

Appeared in Year: 2011

MCQ▾

Question

A one – dimensional chain consists of a set of N rods each of length Equation . When stretched by a load, each rod can align either parallel or perpendicular to the length of the chain. The energy of a rod is Equation when aligned parallel to the length of the chain and is Equation when perpendicular to it. When the chain is in thermal equilibrium at temperature T, its average length is – (December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 54

» Thermodynamic and Statistical Physics » Bose-Einstein Condensation

Appeared in Year: 2011

MCQ▾

Question

The excitations of a three – dimensional solid are bosonic in nature with their frequency Equation and wave – number k are related by Equation in the large wavelength limit. If the chemical potential is zero, the behaviour of the specific heat of the system at low temperature is temperature is proportional to – (December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

T

d.

Equation

Question number: 55

» Thermodynamic and Statistical Physics » Thermodynamic Potentials

Appeared in Year: 2011

MCQ▾

Question

A heater and a thermocouple are used to measure and control temperature T of a sample at Equation . A feedback circuit supplies power ‘P’ to the heater according to the equation Equation with approximately tuned values of coefficients G and D. In order to maintain temperature stability in the presence of an external heat perturbation which causes small but rapid fluctuation of temperature, it is necessary to, (December)

Choices

Choice (4) Response

a.

Decrease G

b.

Increase G

c.

Increases D

d.

Decrease D

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