Define emissive power, coefficient of emission and absorptive power.

Define coefficient of emission.

Define Dispersive Power.

What is absorptive power ?

Dimensions of emissive power are

What is coefficient of emission (emissivity)?

S.I unit of emissive power is

Define coefficient of absorption , coefficient of reflection and coefficient of transmission. Obtain relation between them.

Define emissive power of a body. State its unit and dimension.

At a given temperature the ratio between emissive power and absorptive power is same for all bodies and is equal to the emissive power of black body This statement is called .

Define co-efficient of emission state kirchoff's law of radiation.