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Compute the surface temperature of the s...

Compute the surface temperature of the sun from the following data:
Distance of earth from the sun `R=1.469xx10^(11)m`
Radius of the sun `r=6.928xx10^(8)m`
Solar constant `S=1.39xx10^(3)Wm^(-2)`
Stefan's constant `sigma=5.73xx10^(-8)Wm^(-2)K^(-4)`

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