Loading [MathJax]/jax/output/HTML-CSS/jax.js


1)

Consider a spherical shell of radius R at temperature T. The black body radiation  inside it can be considered as an ideal gas of photons with internal energy per unit volume  u=UVT4 and pressure p=13(UV). If the shell now undergoes an adiabatic expansion, the relation between T and R is


A) TeR

B) Te3R

C) T1R

D) T1R3

Answer:

Option C

Explanation:

According to question

 p=13(UV)

    nRTV=13(UV)                 [   pV=nRT]

   or    nRTV13T4

   or     VT3  = constant

   or    43πR3T3=constant

  or      TR= constant

       T1R