Question

# For a planet revolving around sun, if $$a$$ and $$b$$ are the respective semi-major and semi-minor axes, then the square of its time period is proportional to

A
(a+b2)3
B
(ab2)3
C
b3
D
a3

Solution

## The correct option is D $$a^{3}$$The square of time period of revoulution is directly proportional to the cube of the semi major axis of the orbit - Kepler's law of planetary motion.Answer is D.Physics

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