Heat Transfer Through Radiation


 
 
Concept Explanation
 

Heat Transfer Through Radiation

Radiation

All hot bodies emit heat by the process of radiation. Radiation of heat does not require a medium. Sunlight comes to the earth because of radiation as there is no medium present between the atmosphere of the earth and the sun.

One can feel the heat of bonfire by standing around it. We get warmth from the room heater because of radiation.

Application Of Radiation.

  •  Electric room heater works on the principle of radiation.
  •  Solar cooker cooks food as the result of reflection of heat radiation coming from the sun with the help of a mirror. At times, it is painted black so that most of the radiation can be absorbed leading to the overall increase in the temperature which leads to the rapid cooking of food
  •  Solar water heater heats water by absorbing heat radiation from the sun.
  •  The principle of heat radiation emitted by living organism can be used in infrared photography.
  • Sample Questions
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    Question : 1

    The atmosphere is heated mainly by ________________________ .

    Right Option : B
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    Question : 2

    In a vacuum flask, which methods of heat transfer are prevented by the vaccum ?

    Right Option : C
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    Question : 3

    Which of the following are correct ?

    (a) The electric room heater works on the principle of radiation.

    (b) The solar water heater heats water by absorbing heat radiation from the sun.

     (c) The principle of heat radiation emitted by living organism can be used in infrared photography.

    Right Option : D
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