Question

Kepler’s third law is known as-
1. Law of orbits
2. Law of areas
3. Law of gravity
4. Law of periods

Answer 1

Correct Answer - Option 4 : Law of periods

The correct answer is option 4) i.e. Law of periods

CONCEPT:

• Kepler's laws of planetary motion
  • The first law (Law of orbits): All the planets revolve around the sun in elliptical orbits having the sun at one of the foci.
  • The second law (Law of areas): The radius vector drawn from the sun to the planet sweeps out equal areas in equal intervals of time.
  • The third law (Law of periods): The square of the time period of revolution of a planet around the sun in an elliptical orbit is directly proportional to the cube of its semi-major axis.

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EXPLANATION:

• Kepler's third law of planetary motion describes the time period of revolution of planets around the sun in an orbit. Hence, it is also known as the law of periods.