Two bodies A and B at temperatures `T_(1)K and T_(2)K` respectively have the same dimensions. Their emissivities are in the ratio of `1 : 3`. If they radiate the same amount of heat per unit area per unit time, then the relation between their temperatures is given by

The amount of heat enerrgy radiated per unit time per unit area by a body depends upon

Two objects A & B have exactly the same shape and are radiating the same power If their temperatures are in the ratio sqrt3 : 1 then the ratio of their emissivities is .

Two bodies of same shape, same size and same radiating power have emissivities 0.2 and 0.8. The ratio of their temperatures is

Two bodies of same shape, same size and same radiating power have emissivities 0.2 and 0.4 The ratio of their temperature is .

Two spheres made of same meterial have radii in the ratio 1:2 both are the same temperature Ratio of heat radiation energy emitted per sec by them is

Two bodies A and B have thermal emissivities of 0.01 and 0.81 respectively the outer surface area of the two bodies are the same. The twobodies emit total radiant spectral radiancy in the radiation from A and B respectively differ by 1.00 mum . If the temperature A is 5802 K, find a. the temperature of B lamda_(B)

Two spheres made of same material have radii in the ratio 1: 2 Both are at same temperature. Ratio of heat radiation energy emitted per second by them is