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Question
What change in heat energy occurs when lead at its melting point
solidifies without change in the temperature?
Options
Latent heat is emitted.
Latent heat is absorbed.
Specific heat capacity is emitted.
Specific heat capacity is absorbed.
Both latent heat and specific heat are emitted.
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Solution
Latent heat is emitted.
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If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat-resistant box then no energy can flow from inside the box or come into the box. In this situation, we get the following principle.
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