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NEET2025PhysicsGravitationActual

The radius of Martian orbit around the Sun is about 4 times the radius of the orbit of Mercury. The Martian year is 687 Earth days. Then which of the following is the length of 1 year on Mercury?

Options

  1. A88 earth days
  2. B225 earth days
  3. C172 earth days
  4. D124 earth days

Correct answer

A. 88 earth days

Step-by-step solution

aligned & T _ Mercury T _ Martian = ( r _ Mercury r _ Martian )^ 3 / 2 = ( 1 4 )^ 3 / 2 = 1 8 & ~T _ Mercury = T _ Martian 8 = 687 8 =85.875 days 88 days aligned

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