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Physics · GRAVITATION

हिन्दी

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A planet moves faster when it is closer to the Sun and slower when it is farther away. Reason (R): The gravitational force on the planet is a central force, so its orbital angular momentum about the Sun remains conserved. In the light of the above statements, choose the correct answer from the options given below:

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
  3. (A) is true but (R) is false.
  4. (A) is false but (R) is true.

Correct answer · Option 1

Both (A) and (R) are true and (R) is the correct explanation of (A).

Explanation

Since torque is zero, L = m r v_perpendicular is constant; as r decreases, v increases, which correctly explains the variation in orbital speed.
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