The temperature of a star is 4990 K. Calculate the power per unit area radiated by the star
in 519 nm to 525 nm range.
(a) 0.230 MW/m²
(b) 0.384 MW/m
(c) 0.390 MW/m
(d) 0.220 MW/m?
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The power output of the star can be calculated by using the formulae power is equal to σAT^4 where σ is the Boltzmann constant which is having the value of 5.7x10-8 Wm^-2K^-4 this equation is know as stefan-boltzman law since the power emitted by a black body is with surface area A and surface temperature T is given by that equation.
Hence, if we place the values in the equation we will get the power as 5.7x10^-8*(4990)^4 which approximately becomes 0.384 MW/m.
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