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The material medium between the heat source and the receiver is NOT affected during the process of heat transmission by ___________. 

This question was previously asked in
HPCL Engineer Mechanical 04 Nov 2022 Official Paper (Shift 2)
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  1. convection
  2. conduction as well as convection
  3. conduction
  4. radiation

Answer (Detailed Solution Below)

Option 4 : radiation
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Detailed Solution

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CONCEPT: 

Radiation:

  • The process of the transfer of heat from one place to another place without heating the intervening medium is called radiation.
  • Radiation takes place by electromagnetic radiation.
  • All bodies radiate thermal radiation above absolute zero temperature.
  • The rate of radiation is more at higher temperatures.
  • Hence, option 4 is correct.

 Additional Information

  • The wavelength range of thermal radiation is from 7700Å to 4 × 106Å.
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