Compare the rate of emission of heat by a black body at `327^@C` with the rate of emission of heat of same body at `27^@C`.

Compare the rate of loss of heat from a metal sphere at 827^@C with the rate of loss of heat from the same sphere at 427^@C , if the temperature of the surrounding is 27^@C .

What emissive power of perfectly black body ?

Compare the rates of emission of heat by a black body maintained at 727^@C and at 227^@C , if the black bodies are surrounded by an enclosure (black) at 27^@C . What would be the ratio of their rates of loss of heat.

Compare the ratio of radiation of metal sphere at 627^@C and 327^@C .

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

Emissive power of a perfectly black body

Using Stefan's law,obtain expression for the rate of loss of heat by a black body in cooler surroundings. How is this expression modified, if the body is not black?

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