Thermal radiation extends over the range of

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BPSC AE Paper 5 (Mechanical) 2012 Official Paper
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  1. 0.01 μ to 0.1 μ 
  2. 0.1 μ to 100 μ
  3. 100 μ to 250 μ
  4. 250 μ to 1000 μ

Answer (Detailed Solution Below)

Option 2 : 0.1 μ to 100 μ
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Concept:

  • Thermal radiation is the transmission of heat in the form of radiant energy from one body to another body by the thermal motion of charged particles of matter.
  • The mechanism of radiation is divided into 3 phases
    • Conversion of thermal energy of the hot source into electromagnetic waves
    • Passage of wave motion through intervening medium
    • Transformation of waves into heat
  • Thermal radiation is limited to wavelengths ranging from 0.1 to 100 µm of the electromagnetic spectrum.

F1 M.J Madhu 20.04.20 D4

  • It includes some portion of UV radiation (0.1 to 0.4 µm), entire visible radiation (0.4 to 0.7 µm), and entire infrared radiation (0.7 to 100 µm)
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