Two identical objects A and B are at temperatures T A and T…

Physics Transmission of Heat Radiation (Stefan's Law) MCQ (Single Correct)

Two identical objects A and B are at temperatures T A and T B respectively. Both objects are placed in a room with perfectly absorbing walls maintained at temperatures T The objects A and B attain temperature T eventually which one of the following is correct statement

‘A’ only emits radiations while B only absorbs them until both attain temperature

A loses more radiations than it absorbs while B absorbs more radiations that it emits until temperature T is attained

Both A and B only absorb radiations until they attain temperature T

Both A and B only emit radiations until they attain temperature T

Text Solution

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The correct answer is:

According to Prevost theory every body radiate heat at all temperature (except 0K) and also absorbs heat from surroundings.

Q  ⇒ ⇒ Object A emits radiations more than the radiations it absorbs.

and ⇒ ⇒ Object B absorbs more radiations than it emits.

After a certain time all bodies attains a common temperature.

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