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

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Question number: 3

» Thermodynamic and Statistical Physics » Blackbody Radiation

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.

8

b.

16

c.

4

d.

2

Question number: 4

» 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 Equation , the frequency below which thermal emission dominates over spontaneous emission is nearest to: (December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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