Two identical metal balls at temperature `200^(@)C` and `400^(@)C` kept in air at `27^(@)C`. The ratio of net heat loss by these bodies is

Temperature of two identical balls are 200^(@)C and 400^(@)C . Both are kept in surroundings of 27^(@)C . The ratio of their rate of radiation energy 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 identical bodies have temperatures 277^(@)C and 67^(@)C . If the surrounding temperature is 27^(@)C , the ratio of loss pf heats of the two bodies during the same interval of time is (apporximately).

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

Two bodies A and B are placed in an evacuated vessel maintained at a temperature of 27^(@)C , the temperature of A is 327^(@)C and that of B is 227^(@)C . Then the ratio of heat loss by body A and B is

Two bodies A and B are placed in an evacuated vessel maintained at a temperature of 27^(@)C , the temperature of A is 327^(@)C and that of B is 227^(@)C . Then the ratio of heat loss by body A and B is