Question

3) The escape velocity from the moon is less
than that of from the earth because ..
A) the moon is the satellite of the earth.
B) the moon is the nearest natural celestial
body to the earth.
C) the moon has moon-phases.
D) None of the above.​

Answer 1

Answer:

Because the escape velocity depends on the mass of the planet thus moon has less gravity compared with the earth because the mass of the moon is lesser as compared to the mass of the earth and that is why the escape velocity of the moon is lesser as compared to the escape velocity of the earth.

As escape velocity depends on the acceleration due to gravity. So, escape velocity for the moon must be less than that for the earth. And due to less escape velocity, the gas molecules easily escape from the planet as they becomes less than the RMS velocity of gas molecules resulting in no atmosphere.