What is a heat pump? state it's coefficient of performance operating in heat pump and refrigerator mode (a sketch would be appropriate).

COP of heat pump

COP of refrigerator pump

Explanation:

Heat pump:

 Heat pump is a device which absorb heat from low temperature and reject the heat at high temperature while consuming some amount of work.

Generally heat pump consists four components compressor ,condenser ,expansion valve and evaporator.

Co-efficient of performance:

       Co-efficient of performance can be define as the ratio of desired effect to the work input.

In heat pump we want to heat our room,water etc so our desired effect will be .

COP of heat pump

On the other hand in refrigerator or air-conditioning we want to cool our so our desired effect will be

COP of refrigerator pump

a) the probability of an electron state being filled if it is located at the Fermi level is = 1/2

b) The Fermi level is exactly at the middle of the valence band and the conduction band

c) The Maxwell - Boltzmann approximation accurate to within 10% for

Explanation:

The explanation to various solution above is on the first, second, third, fourth and fifth uploaded image