JEE MainPhysicsGravitationMCQ+4 / −1
Two planets and having masses and move around the sun in circular orbits of and radii respectively. If angular momentum of is and that of is , the ratio of time period is:
- A
- B
- C
- D
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Correct answer: D
- Angular momentum of a planet in circular orbit
For a planet of mass moving in a circular orbit of radius around the Sun, where is orbital speed.
From gravitation providing centripetal force, so,
Hence, So,
- Apply given data for planets and
For planet ,
For planet ,
Taking ratio,
Thus,
Squaring both sides,
- Use Kepler's third law
For planets orbiting the same Sun, Therefore,
So,
Using we get
Hence,
Now, so,
- Match with options
This corresponds to: which is Option D.
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