NEET UG PHYSICS MCQ: GRAVITATION

1 Hard

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Analyzing +4 | -1

A double star consists of two stars having masses

M

and

2 M

. The distance between their centres is equal to

r

. They revolve under their mutual gravitational interaction. Then, which of the following statement(s) is/are correct?

View answer and explanation

Correct option: B

Both of the stars revolve with the same period which is equal to

\frac{2 \pi}{\sqrt{2 G M / 3}} r^{3 / 2}

Option B (Both of the stars revolve with the same period which is equal to

\frac{2 \pi}{\sqrt{2 G M / 3}} r^{3 / 2}

) is correct because the stars revolve around their center of mass with the same period, and the period can be calculated using Kepler's third law.

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