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40. Periodic time of a satellite revolving above Earth’s surface at a height equal to R, radius of Earth, is [g is acceleration due to gravity at Earth’s surface]

(a)  2π√2R/ g                      (b) 4√2π√R/g

(c)     2π√R/ g                             (d) 8π√R/ g

Answer:b

 

(7)

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