Two bodies `A` and `B` having equal surface areas are maintained at temperatures `10^(@)C` and `20^(@)C` . The thermal radiation emitted in a given time by `A` and `B` are in the ratio

Two black bodies A and B have equal surface areas and are maintained at temperatures 27^@ C and 177^@ C respectively. What will be the ratio of the thermal energy radiated per second by A to that by B?

A black body is heated from 7^(@)C to 287^(@)C . The ratio of radiation emitted is:

Two bodies are at temperature 27^(@) and 927^(@)C . The heat energy radiated by them will be in the ratio:

Two bodies hae temperatures as 227^(@)C and 727^(@)C ratio of heat radiated by them will be

Two bodies A and B having equal outer surface areas have thermal emissivity 0.04 and 0.64 respectively. They emit total radiant power at the same rate. The difference between wavelength corresponding to maximum spectral radiance in the radiation from B and that from A is 2 mum . If the temperature of A is 6000 K, then

Two bodies A and B are kept in evacuated vessels maintained at a temperature of 27^(@)C . The temperature of A is 527^(@)C and that of B is 127^(@)C . Compare the rates at which heat is lost from A and B.

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

A cylindrical rod of aluminium is of length 20 cm and radius 2 cm. The two ends are maintained at temperatures of 0^(@)C and 50^(@)C the coefficient of thermal conductivity is (0.5" cal")/(cm xx sec xx ""^(@)C) . Then the thermal resistance of the rod in ("cal")/(sec xx ""^(@)C) is

If the temperature of a black body be increased from 27^(@)C to 327^(@)C the radiation emitted increases by a fraction of

A black body is heated from 27^(@)C to 127^(@)C . The ratio of their energies of radiation emitted will be