1.

In a dark room with ambient temperature T_(0), a black body is kept at a temperature T. Keeping the temperature of the black body constant (at T), sun rays are allowed to fall on the black body through a hole in the roof of the dark room. Assuming that there is no change in the ambient temperature of the room, which of the following statement(s) is/are correct ?

Answer»

the quantity of radiation absorbed by the blackbody in unit time will INCREASE
since emmissivity = absorptivity, hence the quantity of radiation EMITTED by black BODY in unit time wall increase
Black body radiates more ENERGY in unit time in the visible spectrum
The refected energy in unit time by the black body remains same

Answer :A::B::C::D


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