The period of revolution of a planet aro...

The period of revolution of a planet around the sun in a circular orbit is same as that of period of similar planet revolving around a star of twice the raduis of first orbit and if `M` is the mass of the sun then the mass of star is

16M

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The correct Answer is:

From Kepler.s 3rd law, `mrw^(2)=(GMm)/(r^(2))T=2pi sqrt((r^(3))/(GM))`

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