Thermodynamics and Statistical Physics-Black-Body Radiation and Planck's Distribution Law (GATE Physics): Questions 1 - 4 of 6

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Question number: 1

» Thermodynamics and Statistical Physics » Black-Body Radiation and Planck's Distribution Law

Appeared in Year: 2016

Short Answer Question▾

Write in Short

The total power emitted by a spherical black body of radius R at a temperature T is P1 . Let P2 be the total power emitted by another spherical black body of radius R2 kept at temperature 2T . The ratio P1P2 is _ . (Give your answer up to two decimal places)

Question number: 2

» Thermodynamics and Statistical Physics » Black-Body Radiation and Planck's Distribution Law

Appeared in Year: 2015

MCQ▾

Question

For a black body radiation in a cavity, photons are created and annihilated freely as a result of emission and absorption by the walls of the cavity. This is because –

Choices

Choice (4) Response

a.

Photons are spin – 1 particle

b.

The chemical potential of the photons is zero

c.

Photons obey Pauli exclusion principle

d.

The entropy of the photons is very large.

Question number: 3

» Thermodynamics and Statistical Physics » Black-Body Radiation and Planck's Distribution Law

Appeared in Year: 2013

MCQ▾

Question

Consider a gas of atoms obeying Maxwell – Boltzmann statistics. The average value of eiap over all the momenta p of each of the particles (where a is a constant vector and a is its magnitude, m is the mass of each atom, T is temperature and k is Boltzmann’s constant) is –

Choices

Choice (4) Response

a.

Zero

b.

e32a2mkT

c.

One

d.

e12a2mkT

Question number: 4

» Thermodynamics and Statistical Physics » Black-Body Radiation and Planck's Distribution Law

Appeared in Year: 2013

MCQ▾

Question

A proton is confined to a cubic box, whose sides have length 1012m . What is the minimum kinetic energy of the proton? The mass of proton is 1.67×1027kg and Planck’s constant is 6.63×1034Js

Choices

Choice (4) Response

a.

1.1×1017J

b.

9.9×1017J

c.

3.3×1017J

d.

6.6×1017J

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