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The moon has no atmosphere because of the

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Low value of

g

Absence of gaseous molecules

Presence of rocks

None of these

answer is A.

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Detailed Solution

The moon has no atmosphere because of the low value of

g

.
The acceleration due to gravity on the moon’s surface is calculated by the given formula.

a = \frac{G M_{m}}{{R_{m}}^{2}} \dots (1)

M_{m} =

Mass of the moon.

R_{m} =

Radius of the moon.
Since

g

is small on the moon, the molecules of the atmospheric gases have escaped. Hence, the atmosphere is absent on the moon.

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