What emissive power of perfectly black body ?

Emissive power of a perfectly black body

A metal cube of length 10 cm radiates heat at the rate of 60 watt. Find its emissive power of a perfectly black body at that temperature.

State the factors on which emissive power of a body depends. What can you say about the emissive power of perfect black body?

Theratioof emissive powerof perfectly blackbody at 1327 ^@C and 527 ^@C is

What is perfectly black body ?

Rates of emission of heat by perfectly black body maintained at temperatures 27° C and 927° C are in ratio

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 .

The amount of radiation emitted by a perfectly black body is proportional to .

The reflectance and emittance of a perfectly black body are respectively

The radiation emitted by a perfectly black body is proportional to