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  1. The period of revolution of a certain planet in an orbit of radius R is T. Its period of revolution in an orbit of radius 4R will be:

    2. A.

     8 T
    B.

     4 T
    C.

     1 T
    D.

     2 T

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    Answer : Option A

    Explanation :

    The period of revolution of a certain planet in an orbit of radius R is T. Its period of revolution in an orbit of radius 4R will be 8T.

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