JEE PHYSICS MCQ: GRAVITATION

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Assertion: Earth does not retain hydrogen molecules and helium atoms in its atmosphere, but does retain much heavier molecules, such as oxygen and nitrogen.
Reason: Lighter molecules in the atmosphere have translational speed that is greater or closer to escape speed of earth.

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Correct option: A

Assertion is True, Reason is True; Reason is a correct explanation for Assertion

Option A (Assertion is True, Reason is True; Reason is a correct explanation for Assertion) is correct because lighter molecules have higher average speeds, making it easier for them to reach escape velocity and leave the atmosphere.

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