Solar radiation is incident at the earth’s surface at an average of 1000 W/m2 on surfaces oriented normal to the rays. For a mean wavelength of lambda= 535nm, calculate(a) the number of photons falling on 1 cm2 of the surface each second,(b) the radiant intensity ,(c) the total power output of the sun,(d) and the power intercepted on earth by a mirror 4 m in diameter.

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