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A star can be approximated to a black body mostly constituted of gas with a surface temperature T. From the black body density of oscillators we can demonstrate that the power emitted in the forward direction by the star of surface area A per unit wavelength is: A exp( )-1 (Eg.1) Maximum emission Using Equation I , give an approximation of the power Permitted at short wavelengths (λ<<1). c.
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