Question
Question: Moon has no atmosphere because...
Moon has no atmosphere because
A
The r.m.s. velocity of all gases is more than the escape velocity from moon's surface
B
Its surface is not smooth
C
It is quite far away from the earth
D
It does not have population and plants
Answer
The r.m.s. velocity of all gases is more than the escape velocity from moon's surface
Explanation
Solution
At the surface of moon vr.m.s. > vescape, hence molecules attains escape velocity, before reaching their r.m.s. velocity so they escape out.