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Question

If the Earth is at 14th of the present distance from the Sun, then the duration of a year on the Earth would have been ____ of the present duration of a year.

A
18th
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B
116th
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C
16th
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D
14th
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Solution

The correct option is A 18th
From Kepler's third law,
T21r31 and given r2=14r1

Therefore, T21T22=r31r32

or, T21T22=(4r2)3r32

or, T2=T18

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