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Q.

There is no atmosphere on moon because

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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.

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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There is no atmosphere on moon because