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Q.

Two identical objects A and B are at temperatures TA and TB respectively. Both objects are placed in a room with perfectly absorbing walls maintained at a temperature T (TA > T > TB). The objects A and B attain the temperature T eventually. Select the correct statements from the following:
(i) A only emits radiation, while B only absorbs it until both attain the temperature T
(ii)A loses more heat by radiation than it absorbs, while B absorbs more radiation than it emits, until they attain the temperature T
(iii) Both A and B only absorb radiation, but do not emit it,until they attain the temperature T 
(iv) Each object continues to emit and absorb radiation even after attaining the temperature T

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a

(i, iii)

b

(i, ii)

c

(ii, iii)

d

(ii, iv)

answer is D.

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Detailed Solution

According to Prevost's theory,

The temperature of A is higher than the temperature of the surrounding hence A radiates heat much larger than it absorbs heat. 

Since the temperature of B is lower than the temperature of the surrounding hence B absorbs heat much larger than it radiates. This process goes on until both A and B reach the temperature T. 

Even after reaching thermal equilibrium, both bodies keep radiating and absorbing.

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