The energy distribution $E$ with the wavelength $(\lambda )$ for the black body radiation at temperature $T\;Kelvin$is shown in the figure. As the temperature is increased the maxima will
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(a) According to Wein's displacement law ${\lambda _m} \propto \frac{1}{T}$.
Hence, if temperature increases ${\lambda _m}$ decreases i.e., peak of the $E - \lambda $ curve shift towards left.
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