First slide

Gravitaional potential energy

Question

There is no atmosphere on moon because

Easy

A

It is closer to earth
B

It revolves round the earth
C

It gets light from the earth
D

RMS speed of gas molecules is greater than the escape velocity on the surface of the moon.

Solution

When moon was formed, its temperature was very high. As a result r.m.s. speed of the molecules of gases surrounding the moon $V_{r m s} = \sqrt{\frac{3 k T}{m}}$
was high and greater than the escape velocity $V_{e} = \sqrt{\frac{2 G M_{m}}{R_{m}}}$
from the surface of moon.
Hence, option -(4) is correct.

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