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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–
  • a)
    A only emits radiations, while B only absorbs it until both attain the temperature T
  • b)
    A loses more heat by radiation than it absorbs, while B absorbs more radiation than it emits, until they attain the temperature T
  • c)
    Both A and B only absorb radiation, but do not emit it, until they attain the temperature T.
  • d)
    Each object continues to emit and absorb radiation even after attaining the temperature T
Correct answer is option 'B,D'. Can you explain this answer?
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Two identical objects A and B are at temperatures TA and TB respectiv...
Explanation:

Statement a) A only emits radiations, while B only absorbs it until both attain the temperature T
This statement is incorrect. Both objects A and B will initially emit and absorb radiation until they reach the temperature T. At the beginning, object A is at a higher temperature than the room temperature T, so it will emit more radiation than it absorbs. Similarly, object B is at a lower temperature than the room temperature T, so it will absorb more radiation than it emits. As time passes, the temperatures of both objects will approach the room temperature T, and their rates of emission and absorption will become equal.

Statement b) A loses more heat by radiation than it absorbs, while B absorbs more radiation than it emits, until they attain the temperature T
This statement is correct. Initially, object A is at a higher temperature than object B, so it will lose more heat by radiation than it absorbs from the surroundings. On the other hand, object B is at a lower temperature than object A, so it will absorb more radiation than it emits. As both objects approach the room temperature T, their rates of heat exchange through radiation will become equal.

Statement c) Both A and B only absorb radiation, but do not emit it, until they attain the temperature T
This statement is incorrect. Both objects A and B will emit and absorb radiation until they reach the temperature T. The rate of emission will initially be higher for the hotter object A and lower for the cooler object B. As the temperatures approach T, the rates of emission and absorption will equalize.

Statement d) Each object continues to emit and absorb radiation even after attaining the temperature T
This statement is correct. Even after attaining the temperature T, both objects will continue to emit and absorb radiation. However, at this point, the rates of emission and absorption will be equal for both objects, resulting in no net transfer of heat. This is known as thermal equilibrium.

In summary, statements b) and d) are correct. Object A loses more heat by radiation than it absorbs, while object B absorbs more radiation than it emits until they both reach the temperature T. Additionally, both objects continue to emit and absorb radiation even after attaining the temperature T.
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Two identical objects A and B are at temperatures TA and TB respectiv...
Heat transfer from a body with a high temperature to a body with a lower temperature, when bodies are not in direct physical contact with each other or when they are separated in space, is called heat radiation.
Every object emits and absorbs the radiations simultaneously, if energy emitted is more than energy absorbed, temperature falls and vice versa.
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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–a)A only emits radiations, while B only absorbs it until both attain the temperature Tb)A loses more heat by radiation than it absorbs, while B absorbs more radiation than it emits, until they attain the temperature Tc)Both A and B only absorb radiation, but do not emit it, until they attain the temperature T.d)Each object continues to emit and absorb radiation even after attaining the temperature TCorrect answer is option 'B,D'. Can you explain this answer?
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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–a)A only emits radiations, while B only absorbs it until both attain the temperature Tb)A loses more heat by radiation than it absorbs, while B absorbs more radiation than it emits, until they attain the temperature Tc)Both A and B only absorb radiation, but do not emit it, until they attain the temperature T.d)Each object continues to emit and absorb radiation even after attaining the temperature TCorrect answer is option 'B,D'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about 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–a)A only emits radiations, while B only absorbs it until both attain the temperature Tb)A loses more heat by radiation than it absorbs, while B absorbs more radiation than it emits, until they attain the temperature Tc)Both A and B only absorb radiation, but do not emit it, until they attain the temperature T.d)Each object continues to emit and absorb radiation even after attaining the temperature TCorrect answer is option 'B,D'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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–a)A only emits radiations, while B only absorbs it until both attain the temperature Tb)A loses more heat by radiation than it absorbs, while B absorbs more radiation than it emits, until they attain the temperature Tc)Both A and B only absorb radiation, but do not emit it, until they attain the temperature T.d)Each object continues to emit and absorb radiation even after attaining the temperature TCorrect answer is option 'B,D'. Can you explain this answer?.
Solutions for 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–a)A only emits radiations, while B only absorbs it until both attain the temperature Tb)A loses more heat by radiation than it absorbs, while B absorbs more radiation than it emits, until they attain the temperature Tc)Both A and B only absorb radiation, but do not emit it, until they attain the temperature T.d)Each object continues to emit and absorb radiation even after attaining the temperature TCorrect answer is option 'B,D'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
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