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Suppose the average intensity of the solar radiation that strikes normally on a surface just outside...

Suppose the average intensity of the solar radiation that strikes normally on a surface just outside Earth's atmosphere is 1.4 kW/m2. (It is actually 1.4 kW/m2.) (a) What would be the radiation pressure pr exerted on this surface, assuming complete absorption? (b) For comparison, find the ratio of pr to Earth's sea-level atmospheric pressure, which is 1.0 x 105 Pa.

Solutions

Expert Solution

intensity of solar radiation is I = 1.4 kW/m2

Radiation pressure is P = I / c

                                      = 1.4 kW/m2 / 3 x 108 m/s

                                      = 4.667 x 10-6 N/m2

  (b)

The ratio between earth's sea-level atmospheric pressure is

                       P / Po = 4.667 x 10-6 N/m2 /  1 x 105 N/m2

                                  = 4.667 x 10-11 N/m2

genius_generous answered 2 years ago
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