problem1) Answer all the problems:

i) What is regenerative cooling?

ii) Prove that C²_m = (2Kt/m).

iii) Describe thermal conduction.

iv) Derive the relation between entropy and probability.

v) Describe thermionic emission.

problem2) Using energy distribution function. Prove that mean kinetic energy of a system is always proportional to temperature.

problem3) What are postulates of quantum physics? Mention plank distribution law.

problem4) Describe following terms:

a) Partition function    

b) Heat capacity

c) Enthalpy        

d) Helmboltz free energy

e) Gibbs free energy