Q.

The graph shown in fig. represents the variation of temperature 7 of two bodies x and y having same surface area with time t due to the emission of radiation. The correct relation between the emissivity and absorptivity power of two bodies is

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a

Ex>Ey and ax

b

Exay

c

Ex>Ey and ax>ay

d

Ex

answer is C.

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Detailed Solution

The Ioss of rate of heat is proportional to temperature difference between body and surroundings. So x loses more rapidly than y and it will absorb in the same way.
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The graph shown in fig. represents the variation of temperature 7 of two bodies x and y having same surface area with time t due to the emission of radiation. The correct relation between the emissivity and absorptivity power of two bodies is