Reflection and Absorption of Heat
Reflection and Absorption of Heat
Reflection And Absorption Of Heat:
When heat falls over an object some of the heat is absorbed by the body and some of the heat is reflected. The temperature of an object increases because of absorption of heat.
Certain day to day phenomenon can be explained by the principle of reflection and absorption of heat:
1. In conventional room heater you can see the reflector attached with it. The reflector of the room heater reflects the heat towards the person sitting or standing near the room heater.
2. Reflection is the cause that umbrella is used to protect from heat of the sun in summer.
3. Dark colour absorbs more heat while light colour reflects most of the heat. That’s why wearing light coloured clothes is preferred in summer, dark coloured clothes are preferred in winter. Dark clothes absorb more heat and keep one comfortable in winter. On the other hand, light clothes reflect most of the heat and keep one comfortable in summer.
4. Now-a-days many kitchen utensils come in black colour, since utensils of black colour absorb more heat and thus cooking becomes faster.
5. Woolen Cloth: Woolen clothes are used in winter season. Wool is a poor conductor of heat. In addition to it; air gets trapped in woolen fibre to further increase the poor conductivity of wool. This prevents the radiation of heat of our body to the surrounding and prevents the cold from surrounding to affect our body. Thus, wearing woolen cloth makes one comfortable in winter season.
Woolen clothes are used in ___________________ . | |||
| Right Option : C | |||
| View Explanation | |||
Why do we wear woolen clothes in winter __________________ .
| |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct ? (a) As heat falls over an object some of the heat is absorbed by the body and some of the heat is reflected. (b) Reflection is the cause that umbrella is used to protect from heat of the sun in summer . (c) Wool is a good conductor of heat. | |||
| Right Option : A | |||
| View Explanation | |||
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