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Physics · GRAVITATION

हिन्दी

The Moon has no atmosphere because:

  1. The root mean square speed of gas molecules can exceed the escape velocity from the Moon's surface.
  2. The Moon revolves around the Earth synchronously in 27.3 days.
  3. The acceleration due to gravity on the Moon is larger than that on Earth.
  4. The gravitational force on the Moon acts towards the Earth instead of the Moon's center.

Correct answer · Option 1

The root mean square speed of gas molecules can exceed the escape velocity from the Moon's surface.

Explanation

Because the Moon's escape speed is very small (\( \approx 2.3\text{ km/s} \)), thermal velocities of gas molecules exceed it, causing any atmosphere to escape.

Related questions

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