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Wien’s law is concerned with:

1. a relation between emissivity and absorptivity of a radiating surface
2. total radiation, emitted by a hot surface
3. an expression for spectral distribution of energy of a radiation from any source
4. a relation between the temperature of a black body and the wavelength at which there is maximum radiant energy per unit wavelength

Correct answer: a relation between the temperature of a black body and the wavelength at which there is maximum radiant energy per unit wavelength

Solution

Wien's law states that the wavelength at which the maximum radiant energy is emitted by a black body is inversely proportional to its absolute temperature. This directly relates temperature to the peak wavelength of emitted radiation.

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