If $\lambda_{ m }$ denotes the wavelength at which the radioactive emission from a black body at a temperature $T \;K$ is maximum, then
AIPMT 2004, Easy
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By Wien's law
$\lambda_{ m }=\frac{ b }{ T }$
Here, ' $b$ ' is constant
$\text { or } \lambda_m \propto T^{-1}$
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