The power radiated by the sun is 3.8 × 1026 W; the average distance between the sun and the earth is 1.5 × 1011 m, (a) What is the average value of the Poynting vector on the surface of the earth? (b) Calculate the rms values of the electric and magnetic fields on the surface of the earth due to solar radiation. (c) Show that the average solar energy incident on the earth is -2 calorie/(cm2 minute) and the radiation pressure on a perfect absorber is 4.47 × 10–6 N/m2.
[Assume that no solar radiation is absorbed by the atmosphere]
