On any planet, the presence of atmosphere implies [ $v_{r m s} =$ root mean square velocity of molecules and $v_{e} =$ escape velocity]

v_{r m s} << v_{e}

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v_{r m s} > v_{e}

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v_{r m s} = v_{e}

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v_{r m s} = 0

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Solution

The correct option is A $v_{r m s} << v_{e}$
Presence of atmosphere on any planet implies that $V_{r m s} <<<< V_{e}$ (if $V_{r m s}$ is equal or greater than escape velocity, then all the gases will disappear from gravitational field of planet and no atmosphere will be present).

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