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###### Debanjana Adhikari posted an Question
May 17, 2020 • 10:12 am 30 points
• CSIR NET
• Physical Sciences

# A cavity contains blackbody radiation in equilibrium at temperaturel. the specific heat per unit volume of the photon gas in the cavity is of the form cp = t',

A cavity contains blackbody radiation in equilibrium at temperaturel. The specific heat per unit volume of the photon gas in the cavity is of the form Cp = T', where 7 is a constant. The cavity is expanded to twice its original volume and then allowed to equilibrate at the same temperature T. The new internal energy per unit volume is (a) 47 (b) 2T (C) T (d)4

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see

• ##### Dhairya sharma

i hope u get it.

• ##### Abhishek singh

Option D is correct. See solution. Best regards.

• ##### Dhairya sharma

see attached.

• ##### Ruby negi

dear option d is correct...

• ##### Ruby negi

here is the solution..

what is the role of volume expansion here??

for blackbody V*T^3 remains constant. And this is the special case , where Cv is also in VT^3 form. That's why this given information has no role

see my solution for better understanding. just in backside of your mind, do remember that VT^3 is constant.

hope now you got it...

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