Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the Sun, respectively. The ratio of the pressure of solar radiation on sphere 2 to that on sphere 1 is
A. 0.25.
B. 0.50.
C. 1.0.
D. 2.0.
E. 4.0.
Answer: A
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