Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 62 - 64 of 64

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Question number: 62

» Thermodynamic and Statistical Physics » Blackbody Radiation

Appeared in Year: 2016

MCQ▾

Question

A two level system in a thermal (black body) environment can decay from the excited state by both spontaneous and thermally stimulated emission. At room temperature , the frequency below which thermal emission dominates over spontaneous emission is nearest to: (December)

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Choice (4) Response

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b.

c.

d.

Question number: 63

» Thermodynamic and Statistical Physics » Thermodynamic Potentials

Appeared in Year: 2016

MCQ▾

Question

A silica particle of radius is put in a container of water at . The densities of silica and water are and , respectively. Due to thermal fluctuations, the particle is not always at the bottom of the container. The average height of the particle above the base of the container is approximately: (December)

Choices

Choice (4) Response

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b.

c.

d.

Question number: 64

» Thermodynamic and Statistical Physics » Laws of Thermodynamics

Appeared in Year: 2017

MCQ▾

Question

A thermodynamic function

Is given in terms of the internal energy , temperature , entropy , pressure , volume and the number of particles . Which of the following relations is true?

(In the following is the chemical potential. ) (June)

Choices

Choice (4) Response

a.

b.

c.

d.

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