The maximum wavelength of radiations emitted at $900\,K$ is $4\mu m$. What will be the maximum wavelength of radiations emitted at $1200 \,K$ ......... $\mu m$
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(a)$\frac{{{\lambda _2}}}{{{\lambda _1}}} = \frac{{{T_1}}}{{{T_2}}} \Rightarrow {\lambda _2} = \frac{{{T_1}}}{{{T_2}}} \times {\lambda _1} = \frac{{900}}{{1200}} \times 4 = 3\mu m$
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