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(C) According to Wien's displacement law,the wavelength corresponding to maximum spectral intensity $\lambda_m$ is inversely proportional to the absol

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(C) According to Wien's displacement law,the wavelength corresponding to maximum spectral intensity $\lambda_m$ is inversely proportional to the absolute temperature $T$:$\lambda_m \propto \frac{1}{T}$Since the frequency $f$ is related to wavelength $\lambda$ by $f = \frac{c}{\lambda}$,where $c$ is the speed of light,we have $\lambda \propto \frac{1}{f}$.Substituting this into Wien's law:$\frac{1}{f} \propto \frac{1}{T} \Rightarrow f \propto T$Therefore,if the temperature $T$ is doubled,the frequency $f$ at which the spectral intensity becomes maximum will also be doubled.

If the temperature of a black body is doubled,the frequency at which the spectral intensity becomes maximum will be

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