Q3

Students plotted the radiation of stars against their wavelengths.

If a star has a surface temperature of $4000\ \mathrm{K}$, what is the maximum wavelength of the radiation emitted by the star?
(A) $0.725 \times 10^{-7}\ \mathrm{m}$
(B) $7.25 \times 10^{-6}\ \mathrm{m}$
(C) $725 \times 10^{-7}\ \mathrm{m}$
(D) $725\ \mathrm{nm}$