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 body radiates energy 5 W at a temperature of 127^(@)C . If the temperature is increased to 927^(@)C , then it radiates energy at the rate of

Two spheres P and Q , of same colour having radii 8cm and 2cm are maintained at temperatures of 127^(@)C . If temperature is increased to 927^(@)C , then it radiates energy at the rate of

Two bodies A and B are kept in an evacuated chamber at 27^@C . The temperatures of A and B are 327^@ and 427^@C and respectively. The ratio of rates of loss of heat from A and B will be–

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

If the temperature of City A is -20 ""^(@)C and the temperature of City B is 10 ""^(@)C , the difference in temperature between the two cities is

Two identical spheres A and B are suspended in an air chamber which is maintained at a temperature of 50^@C . Find the ratio of the heat lost per second from the surface of the spheres if a. A and B are at temperatures 60^@C and 55^@C , respectively. b. A and B are at temperatures 250^@C and 200^@C , respectively.

The temperatures of two bodies A and B are 727^(@)C and 127^(@)C . The ratio of rate of emission of radiations will be

Water is filled in a vessel which is kept in a room at a temperature of 20^(@)C . The temperature of the water is slowly increased. When the temperature of water is 40^(@)C , it loses heat at the rate of 10cal/s. What will be the rate of loss of heat when the temperature of water is 80^(@)C ?