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42. A geo-stationary satellite is orbiting the earth at a height of 6 R above the surface of earth, R being the radius of earth. The time period of another satellite at a height of 2.5 R from the surface of earth is

(a)  10 hr                                  (b) (6/√2) hr

(c)   6 hr                                     (d) 6√2hr

Answer: d

(4)

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