The rectangular surface of area `8 cm xx 4 cm` of a black body at temperature `127^(@)C` emits energy `E` per section if length and breadth are reduced to half of the initial value and the temperature is raised to `327^(@)C`, the ratio of emission of energy becomes

The rectangular surface of area 8cmxx4cm of a black body at a temperature of 127^(@)C emits energy at rate of E per second. If the length and breadth are reduced to half of its initial value and the temperature is raised to 327^(@)C , the rate of emission of energy will be

The rectangular surface area 12cm xx 6cm of a black body at a temperature of 127^(@)C , emits heat energy at the rate of Q units per second. If the length and breadth of the surface area are each reduced to half of its initial value and the temperature is increased to 327^(@)C , then the rate of emission of heat energy will be

A black rectangular surface of area A emits energy E per second at 27^circC . If length and breadth are reduced to initial value and temperature is raised to 327^circC , then energy emitted per second becomes

A black rectangular surface of area A emits energy E per second at 27^circC . If length and breadth are reduced to one third of initial value and temperature is raised to 327^circC , then energy emitted per second becomes

A black rectangular surface of area A emits energy E per second at 27^circC . If length and breadth are reduced to one third of initial value and temperature is raised to 327^circC , then energy emitted per second becomes

A black body is at a temperature of 527^(@)C , to radiate twice as much energy per second its temperature must be increased to

A black body is at a temperature of 527^@C , to radiate twice as much energy per second its temperature must be increased to

A body of surface area 10 cm^(2) and temperature 727 ^(@) C emits 600 J of enrgy per minute. Find its emissivity.