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The law which states that the wavelength of maximum radiation is inversely proportional to the absolute temperature of the emitting body is known as

  • A.Wien’s Displacement Law
  • B.Ohm's Law
  • C.Ferel's Law
  • D.Ampere's Law

Answer: A

This is Wien's displacement law.

\[\lambda_{max}T = b = 2.898\times10^{-3}\ \mathrm{m\,K}\] So the hotter a body, the shorter the wavelength at which it radiates most. It is why an iron heated in a fire glows red, then orange, then white, and why the sun's peak is in the visible while ours is in the infrared.

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