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Escape Speed

The earth ret...

Question

The earth retains its atmosphere. This is due to

A

the special shape of the earth.

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B

the escape velocity, which is greater than the mean speed of atmospheric molecules.

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C

the escape velocity, which is less than the main speed of atmospheric molecules.

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D

the suns gravitational effect.

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Solution

The correct option is B the escape velocity, which is greater than the mean speed of atmospheric molecules.
The earth retains its atmosphere. This is due to the escape velocity being greater than the mean speed of the molecules of the atmospheric gases.

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Similar questions

Q. Assertion :The earth does not retain hydrogen molecules and helium atoms in its atmosphere, but dies 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.

Q. Assertion :The 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 its greater or closer to escape speed of earth.

Q. The atmosphere on a planet is possible only if [where

v_{r m s}

is root mean square speed of gas molecules on planet and

v_{e}

is escape velocity on its surface]

Q. On any planet, the presence of atmosphere implies :
(

v_{r m s} =

root mean square velocity of molecules,

v_{e} =

escape velocity)

Q. On any planet, the presence of atmosphere implies [

v_{r m s} =

root mean square velocity of molecules and

v_{e} =

escape velocity]

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