The wavelength of maximum intensity of radiation emitted by a star is $289.8 \,nm$. The radiation intensity for the star is : (Stefan’s constant $5.67 \times {10^{ - 8}}W{m^{ - 2}}{K^{ - 4}}$, constant $b = 2898\mu mK)$
According to Stefan’s Law
$E = \sigma {T^4} = (5.67 \times {10^{ - 8}}){({10^4})^4}$$ = 5.67 \times {10^8}W/{m^2}$
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