A) Low escape velocity of air molecule and low gravitational attraction
B) High escape velocity of air molecule and low gravitational attraction
C) Low gravitational attraction
D) High escape velocity of air molecule only
Correct Answer: D
Solution :
[d] For most practical purposes, the Moon is considered to be surrounded by vacuum. The elevated presence of atomic and molecular particles in its vicinity (compared to interplanetary medium), referred to as 'lunar atmosphere' for scientific objectives, is negligible in comparison with the gaseous envelope surrounding Earth and most planets of the Solar system-less than one hundred trillionth (10-14) of Earth's atmospheric density at sea level. Otherwise the Moon is considered to not have an atmosphere as it cannot absorb measurable quantities of radiation, does not appear layered or self-circulating, and requires constant replenishment given the high rate at which the atmosphere is lost to space.
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