Doubt as to application of Wien's displacement law

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SUMMARY

Wien's displacement law does not hold true for non-black bodies, specifically those with emissivity values not equal to 1. The discussion highlights that even for materials like sodium vapor, which have non-zero emissivity only within a narrow wavelength range, the peak emission remains constant at yellow regardless of temperature. This conclusion emphasizes the limitations of Wien's law when applied to real-world materials with varying emissivity characteristics.

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  • Understanding of thermal radiation principles
  • Familiarity with emissivity concepts
  • Knowledge of Wien's displacement law
  • Basic physics of blackbody radiation
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  • Study the behavior of sodium vapor in thermal contexts
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Do Wien's displacement law hold true even for bodies with emissivity not equal to 1, that is, non-black bodies?
 
Science news on Phys.org
No.
Just imagine the body which emissivity is non-zero only in some narrow span (e.g. vapour of Sodium). Regardless of temperature its maximum of emission is always yellow.
 

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