Question

Solar radiation emitted by the sun resembles that emitted by a black body at a temperature of $6000$ K. Maximum intensity is emitted at a wavelength of about $4800A$${}^o$. If the sun were to cool down from $6000K$ to $3000K$, then the peak intensity would occur at a wavelength of:

• A. 4800A${}^o$
• B. 9600A${}^o$
• C. 2400A${}^o$
• D. 19200A${}^o$

Answer 1

The correct option is B 9600A${}^o$

We know that from wines's displacement law
${\lambda }_{max}\times T=constant$
so${\lambda }_b\times T_{max}=\lambda \times T$
$6000\times 4800=\lambda \times 3000$
$\lambda =9600A^0$