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 $T$ ) sunrays 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 is/are correct?

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The quantity of radiation absorbed by the black body in unit time will increase.

Since emissivity $=$ absorptivity, hence the quantity of radiation by black body in unit time will increase

Black body radiates more energy in unit time in the visible spectrum

The reflected energy in unit time by the black body remains same

answer is A, B, C, D.

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Detailed Solution

With the incident radiation, the temperature of black body try to increase, so body emits more energy per unit time. To keep the temperature constant it must absorbs incident radiations with increased rate. The reflection depends on the nature of surface not on the temperature.

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