70th B.P.S.C Re-Exam 2024

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✓ Correct
cIt revolves around Earth
dIt gets light from Sun

Explanation

The Moon’s escape velocity is low, so the RMS speed of gas molecules becomes equal to or greater than it, so they escape into space. Hence, an atmosphere like Earth’s is not found on the Moon.

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