Two satellites S1 and S2 are to be set into the orbits of heights of heights R/4 and R/6 (above the surface of earths), respectively, They revolve around the earth in coplanar circular orbits in opposite sense . Which of the following statement(s) is/are correct?

Q: Two satellites S1 and S2 are to be set into the orbits of heights of heights R/4 and R/6 (above the surface of earths), respectively, They revolve around the earth in coplanar circular orbits in opposite sense (where, R = radius of earth). Which of the following statement(s) is/are correct ?

((a) The ratio of time periods is  (15/14)3/2

(b) The ratio of their periods is (14/15)3/2

(c) The ratio of their speeds of projection from the surface of earth is √(23/15)

(d) The ratio of their speeds of projection from the surface of earth is √(21/20)

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Ans: (a) , (d)