MCQ
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 $({T_A} > T > {T_B}).$ The objects A and B attain temperature $T $ eventually which one of the following is correct statement
  • A
    ‘$A$’ 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
  • 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 $T$

Answer

Correct option: B.
$A$ loses more radiations than it absorbs while $B$ absorbs more radiations that it emits until temperature $T$ is attained
b
(b) According to Prevost theory every body radiate heat at all temperature (except 0K) and also absorbs heat from surroundings.

${T_A} > T$ ==> Object $A$ emits radiations more than the radiations it absorbs.

and ${T_B} < T$ ==> Object $B$ absorbs more radiations than it emits.
After a certain time all bodies attains a common temperature.

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