Question

Question:- Two bodies at different temperature are mixed in a calorimeter. Which of the following quantities remains conserved?

(A) sum of the temperature of the bodies.
(B) total heat of the two bodies.
(C) total energy of the two bodies.
(D) internal energy of each body.

Answer 1

B option is correct.
When 2 bodies at different temperature are mixed heat will be transferred from body at higher temperature to body at lower temperature till both acquire same temperature.
Heat lost = Heat gain
Hence , principle of calorimetry represents "law of conservation of heat energy ".

Answer 2

Two bodies at different temperature are mixed in a calorimeter. Then total internal energy of the two bodies are conserved.

Explanation:

• If 2 bodies are combined in the calorimeter at various temperatures, the heat transfers from one body to the next due to the change in temperature. That results in a shift in the individual bodies ' internal energy.
• The calorimeter involves no exchange of energy with the ambient. Therefore, the bodies ' overall internal energy remains conserved, because there is no further work on them.

Therefore the correct option is (c) Total internal energy of the two bodies

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