There is no atmosphere on the surface of the moon because
- AIt is closer to Earth
- BEscape velocity of gas molecules is less than RMS velocity
- CIt revolves around Earth
- DIt gets light from Sun
Show answer and explanation
Correct answer: (b) Escape velocity of gas molecules is less than RMS velocity
Explanation
The Moon's gravity is weak, so its escape velocity is low, only about 2.4 km/s. Gas molecules move fast enough (their RMS speed) to escape from it over time.
So the Moon could not hold an atmosphere.