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Question

The graph shown in the adjacent diagram represents the variation of temperature (T) of two bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity (e) and absorptivity (a) of the two bodies.

A
ex>ey and ax<ay
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B
ex<ey and ax>ay
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C
ex>ey and ax>ay
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D
ex<ey and ax<ay
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Solution

The correct option is C ex>ey and ax>ay
Rate of cooling (dTdt)emissivity (e)
From graph, (dTdt)x>(dTdt)yex>ey
Further emissivity (e) Absorptive power (a)ax>ay
( good absorbers are good emitters)

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