Two black bodies at `327^(@)C` and `627^(@)C` are suspended in an environment at `27^(@)C` The ratio of their emissive powers is .

Two black bodies at temperatures 327^@ C and 427^@ C are kept in an evacuated chamber at 27^@ C . The ratio of their rates of loss of heat are

Two black bodies at temperatures 327^@ C and 427^@C are kept in an evacuated chamber at 27^@C . The ratio of their rates of loss of heat are :

Two black bodies at temperature 327^(@)C and 427^(@)C are arranged in a box of 27^(@)C variable temperature of free space, the ratio of their rate of radiant energy is . . . . ..

The rate of emission of radiation of a black body at temperature 27^(@)C is E_(1) . If its temperature is increased to 327^(@)C the rate of emission of radiation is E_(2) . The relation between E_(1)andE_(2) is