Question

Assertion : Moon has no atmosphere.
Reason : The escape velocity for moon is less than that for earth.
A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are truebut reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Answer 1

Correct Answer - A
(a) The escape velocity for earth is 11.2 km `s^(-1)` . The escape velocity for moon is 2.3 km `s^(-1)`. Gas molecules if formed on the surface of the moon having velocities larger than this will escape the gravitational pull of the moon.