Thermodynamic and Statistical Physics-Blackbody Radiation (CSIR Physical Sciences): Questions 1 - 2 of 3

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Question number: 1

» Thermodynamic and Statistical Physics » Blackbody Radiation

Appeared in Year: 2014

MCQ▾

Question

Which of the graphs below gives the correct qualitative behavior of the energy density ET(α) of black body radiation of wavelength λ at two temperature T1 and T2(T1<T2) ? (June)

Choices

Choice (4) Response

a.

Energy density as a function of wavelength: Choice A

Energy Density as a Function of Wavelength: Choice A

In figure, the graph shows the qualitative behavior of the energy density of black body radiation of wavelength at two temperatures.

b.

Energy density as a function of wavelength: Choice B

Energy Density as a Function of Wavelength: Choice B

In figure, the graph shows the qualitative behavior of the energy density of black body radiation of wavelength at two temperatures.

c.

Energy density as a function of wavelength: Choice C

Energy Density as a Function of Wavelength: Choice C

In figure, the graph shows the qualitative behavior of the energy density of black body radiation of wavelength at two temperatures.

d.

Energy density as a function of wavelength: Choice D

Energy Density as a Function of Wavelength: Choice D

In figure, the graph shows the qualitative behavior of the energy density of black body radiation of wavelength at two temperatures.

Question number: 2

» Thermodynamic and Statistical Physics » Blackbody Radiation

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 CV=γT3 , where γ 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.

γT44

b.

4γT4

c.

2γT4

d.

γT4

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