There is no atmosphere on moon because

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It is closer to earth

It revolves round the earth

It gets light from the earth

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

answer is D.

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Detailed 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 Vrms=3kTmwas high and greater than the escape velocity Ve=2GMmRmfrom the surface of moon.Hence, option -(4) is correct.

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