Three bodies A,B and C have equal areas which are painted red, yellow and black respectively. If they are at same temperature then

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 ?

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?

Three stars A, B, C appear as green, red and blue respectively. Which star has minimum temperature?

Three stars A, B and C appears as green, red and blue respectively. The star having minimum temperature is

Four copper plates of the same dimensions are painted with red, green, white and black colours. All of them are heated upto a temperature of 300^(@)C and then allowed to cool in the surrounding, which is at room temperature. Which plate would cool at the earliest?

Three bags A,B and C contain 6 red, 4 black and 5 red, 5 black balls and 4red, 6black balls respectively. A bag is selected at random (each of the three bags being equally liekly to be selected and from the the selected bag, a ball is drawn at random. If this ball s found to be red, find the probability that it is drawn from the bag A.

Equal masses of three liquids A, B and C have temperature 10^(@)C, 25^(@)C and 40^(@)c respectively. If A and B are mixed, the mixture has a temperature of 15^(@)C . If B and C are mixed, the mixture has a temperature of 30^(@)C , if A and C are mixed will have a temperature of

Equal masses of three liquids A, B and C have temperature 10^(@)C, 25^(@)C and 40^(@)c respectively. If A and B are mixed, the mixture has a temperature of 15^(@)C . If B and C are mixed, the mixture has a temperature of 30^(@)C , if A and C are mixed will have a temperature of

Equal masses of three liquids A, B and C have temperature 10^(@)C, 25^(@)C and 40^(@)c respectively. If A and B are mixed, the mixture has a temperature of 15^(@)C . If B and C are mixed, the mixture has a temperature of 30^(@)C , if A and C are mixed will have a temperature of