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Question
To study energy exchange between hot and cold objects, the system of both objects is isolated from the environment by keeping them inside ______.
Options
a heat-resistant box
a rectangular box
Hope’s apparatus
None of these
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Solution
To study energy exchange between hot and cold objects, the system of both objects is isolated from the environment by keeping them inside a heat resistant box.
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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.
Heat energy lost by the hot object = Heat energy gained by the cold object. This is called the ‘Principle of heat exchange’.
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