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The radii of two planets are respectively R1 and  R2  and their densities are respectively  p1  and p2  . The ratio of the accelerations due to gravity at their surfaces is

(a)    g1:g2 = p1/R12: p2/R22                      (b)  g1:g2 = R1R2 :  p1p2

(c)   g1:g2 =  R1 p2 : R2p1                         (d)    g1:g2 =  R1p1  : R2p2

Answer: d

(8)

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