The average magnitude of the Poynting vector for sunlight arriving at the top of Earth's atmosphere (1.5 X 1011 m from the Sun) is about 1.4 kW/m2.
(a) Compute the average radiation pressure exerted on a metal reflector facing the Sun.
(b) Approximate the average radiation pressure at the surface of the Sun whose diameter is 1.4 × 109m.
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