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Q.
Shown below are the black body radiation curves at temperatures $T_{1}$ and $T_{2}\left(T_{2}>T_{1}\right) .$ Which of the following plots is correct?
From Wien's displacement law, we know that,
$\lambda_{m} T=$ constant
which means that as temperature increases then the
wavelength having the maximum intensity shifts towards
left. Here, $T_{2} >T_{1}$.
$\therefore \lambda_{m T_{2}} < \lambda_{m T_{1}}$
But in plot (a) $\lambda_{m T_{2}}=\lambda_{m T_{1}}$,
in plot (b) $\lambda_{m T_{2}} > \lambda_{m T_{1}}$
and in plot (d) $\lambda_{m T_{2}} >\cdot \lambda_{m T_{1}}$
Therefore the correct plot is (c) where
$\lambda_{m T_{2}} < \lambda_{m T_{1}}$.