According to Wien's law, the wavelength `(lambda)` corresponding to the maximum light intensity emitted from a blackbody at temperature T is given by `lambdaT=2.9xx10^(-3) mK`. Calculate the surface temperature of a star whose blackbody radiation has a peak intensity corresponding to then `n=1 rarr n=2` excitation of hydrogen.

Answer

`T=2.9xx10^(-3)m K//1.215xx10^(-7) m=2.4xx10^(4) K`