Question Bank MCQ • 1 Mark Section 5: Thermodynamics & Statistical Physics Blackbody radiation

QB_PH_142: Blackbody radiation

Question Statement

The radiation pressure $P$ of an isotropic photon gas in terms of internal energy density $u$ is:
(A) P = \frac{1}{3} u
(B) P = u
(C) P = \frac{2}{3} u
(D) P = \frac{1}{2} u
Correct Answer
A
Verified Key

Step-by-Step KaTeX Derivation & Detailed Explanation

### Solution: For ultra-relativistic particles and photons, $P = u/3$.
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