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JEE Main & Advanced Physics Transmission of Heat Question Bank Radiation Stefan's law

  • question_answer
    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 temperatures T \[({{T}_{A}}>T>{{T}_{B}}).\] The objects A and B attain temperature T eventually which one of the following is correct statement  [CPMT 1997]

    A)            ?A? only emits radiations while B only absorbs them until both attain temperature 

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

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

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

    Correct Answer: B

    Solution :

                       According to Prevost theory every body radiate heat at all temperature (except 0K) and also absorbs heat from surroundings. Q \[{{T}_{A}}>T\] Þ Object A emits radiations more than the radiations it absorbs. and \[{{T}_{B}}<T\] Þ Object B absorbs more radiations than it emits. After a certain time all bodies attains a common temperature.


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