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Heat Transfer

Q1: Which one gives the monochromatic emissive power for black body radiation ?

A Planck's law

B Kirchhoffs law

C Wien's law

D Stefan-Boltzman law

ANS:A - Planck's law

The monochromatic emissive power for black body radiation is provided by Wien's law. Wien's law gives the relationship between the temperature of a black body and the wavelength at which it emits the maximum intensity of radiation. It states that the wavelength of maximum emissive power (maxλmax​) is inversely proportional to the absolute temperature (T) of the black body: max=λmax​=Tb​ Where:

  • maxλmax​ is the wavelength of maximum emissive power,
  • b is Wien's displacement constant (≈2.897×10−3 m⋅K≈2.897×10−3m⋅K),
  • T is the absolute temperature of the black body.
Therefore, Wien's law specifically deals with the wavelength at which a black body emits maximum radiation intensity, making it the law that provides the monochromatic emissive power for black body radiation.



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