Thermodynamic and Statistical Physics-Blackbody Radiation (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 1 - 3 of 4

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Question number: 1

» Thermodynamic and Statistical Physics » Blackbody Radiation

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Appeared in Year: 2014

MCQ▾

Question

Which of the graphs below gives the correct qualitative behavior of the energy density of black body radiation of wavelength at two temperature and ? (June)

Choices

Choice (4)Response

a.

Energy density as a function of wavelength: Choice A

Energy Density as a Function of Wavelength: Choice A

b.

Energy density as a function of wavelength: Choice B

Energy Density as a Function of Wavelength: Choice B

c.

Energy density as a function of wavelength: Choice C

Energy Density as a Function of Wavelength: Choice C

d.

Energy density as a function of wavelength: Choice D

Energy Density as a Function of Wavelength: Choice D

Question number: 2

» Thermodynamic and Statistical Physics » Blackbody Radiation

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Appeared in Year: 2011

MCQ▾

Question

A cavity contains blackbody radiation in equilibrium at temperature T. The specific heat per unit volume of the photon gas in the cavity is of the form , where is a constant. The cavity is expanded to twice its original volume and then allowed to equilibrate at the same temperature T. The new internal energy per unit volume is – (June)

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 3

» Thermodynamic and Statistical Physics » Blackbody Radiation

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Appeared in Year: 2012

MCQ▾

Question

Consider black body radiation contained in a cavity whose walls are at temperature T. The radiation is in equilibrium with the walls of the cavity. If the temperature of the walls is increased to 2T and the radiation is allowed to come to equilibrium at the new temperature, the entropy of the radiation increases by a factor of (June)

Choices

Choice (4)Response

a.

16

b.

2

c.

8

d.

4

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