Thermodynamics and Statistical Physics-Black-Body Radiation and Planck's Distribution Law (GATE Physics): Questions 1 - 3 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 Equation at a temperature Equation is Equation . Let Equation be the total power emitted by another spherical black body of radius Equation kept at temperature Equation . The ratio Equation is Equation . (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 Equation over all the momenta Equation of each of the particles (where Equation is a constant vector and Equation is its magnitude, Equation is the mass of each atom, T is temperature and Equation is Boltzmann’s constant) is –

Choices

Choice (4) Response

a.

Zero

b.

Equation

c.

One

d.

Equation

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