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Q.

Two identical objects A and B are at temperatures  TA  andTB respectively. Both objectives 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

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a

Each object continue to emit and absorb radiation even after attaining the temperature T.

b

Both A and B only absorb radiation, but do not emit it, until they attain the temperature T.

c

A only emits radiation, while B only absorbs it until both attain the temperature T.

d

A loses more heat by radiation than it absorbs, while B absorbs more radiation than it emits, until they attain the temperature T.

answer is B, D.

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Detailed Solution

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TA>T         Loss by radiation > absorption by radiation        TB<T

Loss by radiation < absorption by radiation

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