Solar radiation emitted by sun resembles that emitted by a black body at a temperature of $6000 K$ . Maximum intensity is emitted at a wavelength of about $4800Å$ . If the sun were to cool down from $6000 K$ to $3000 K$ then the peak intensity would occur at a wavelength ....... $\overset{o}{\mathop{A}}\,$
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(b) ${\lambda _{{m_2}}} = \frac{{{\lambda _{{m_1}}}{T_1}}}{{{T_2}}} = \frac{{4800 \times 6000}}{{3000}}$=$9600Å$
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