A Guide to Physics Problems. Part 2. Thermodynamics, Statistical Physics, and Quantum Mechanics

THERMODYNAMICS AND STATISTICAL PHYSICS 191

4.77 Blackbody Radiation and Early Universe (Stony

Brook)

By definition the free energy

The entropy is then

a)

b)

The energy of the system

Alternatively, the entropy can be found from

or

So,

where can be expressed from (S.4.77.3) as