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

    $(6/\sqrt 2 )\,hr$

  • C

    $6\, hr$

  • D

    $6\sqrt 2 \,hr$

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