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NTA Abhyas JEE Main2020PhysicsGravitationPractice

If the earth be in half of its distance from the Sun, how many days will be in one year?

Options

  1. A183
  2. B730
  3. C129
  4. D365

Correct answer

C. 129

Step-by-step solution

According to Kepler's laws T 2 ∝ R 3 When R 2 = R 1 2 T 2 2 T 1 2 = R 1 2 3 × 1 R 1 3 = R 1 3 8 × 1 R 1 3 = 1 8 T 2 2 T 1 2 = 1 8 ⇒ T 2 = T 1 2 2 = 365 2 × 1.414 T 2 = 129 d a y s

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