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 The wavelength of the radiation emitted by a body depends upon
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The correct answer is:
the temperature of the surface 
 According to Wien's law, the wavelength of radiation emitted by a body is
$\lambda \propto \frac{1}{T}$
i.e., it depends on the temperature of the surface.
 $\lambda \propto \frac{1}{T}$
i.e., it depends on the temperature of the surface.
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