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A geostationary satellite orbits around the earth in a circular orbit of radius

A geostationary satellite orbits around the earth in a circular orbit of radius 36000 km. Then, the time period of a satellite orbiting a few hundred kilometres above the earth’s surface  (REarth = 6400 km ) will approximately be

(a)  1/2 h                                  (b)  1 h

(c)   2 h                                      (d)  4 h

Answer: c

(17)

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