First slide
Radiation
Question

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

Moderate
Solution

STATEMENTS ii)  , iv) are true  according to Prevost's theory.

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