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प्रश्न
Study the following procedure and answer the questions below:
1. Take 3 spheres of iron, copper and lead of equal mass.
2. Put all the 3 spheres in boiling water in a beaker for some time.
3. Take 3 spheres out of the water. Put them immediately on a thick slab of wax.
4. Note, the depth that each sphere goes into the wax.
i) Which property of substance can be studied with this procedure?
ii) Describe that property in minimum words.
iii) Explain the rule of heat exchange with this property.
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उत्तर
i. Specific heat
ii. Specific heat : The amount of heat energy required to raise the temperature of a unit mass of an object by 1oC .
iii. According to the principle of hear exchange :
Heat energy lost by the hot object = Heat energy gained by the cold
object
In this activity heat absorbed by iron sphere is transmitted more in the wax, hence sphere goes deepest in to wax, while lead sphere absorbs less heat, resulting in less transmission of heat in the wax hence sphere goes the least depth in the wax.
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Read the following paragraph and answer the questions.
|
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 the 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 (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box. |
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