Thermodynamics and Statistical Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 82 - 82 of 82

Access detailed explanations (illustrated with images and videos) to 659 questions. Access all new questions- tracking exam pattern and syllabus. View the complete topic-wise distribution of questions. Unlimited Access, Unlimited Time, on Unlimited Devices!

View Sample Explanation or View Features.

Rs. 450.00 -OR-

How to register? Already Subscribed?

Question 82

Thermodynamics and Statistical Physics

Appeared in Year: 2017

Describe in Detail

Essay▾

The energy density and pressure of a photon gas are given by and , where is the temperature and is the radiation constant. The entropy per unit volume is given by . The value of is ________. (up to two decimal places) .

Explanation

The energy density of a photon gas is given as,

Since, ;

Now, Heat capacity is given by,

Now, entropy of photon gas is,

Entropy per unit volume,

According to question,

Substituting value of , from equation (1) ,

Developed by: