First slide

Gravitaional potential energy

Question

The earth is able to retain its atmosphere because of

Easy

A

the rms velocities of atmospheric gas molecules which is less than that of the earth’s escape velocity
B

the mean velocities of atmospheric gas molecules which is greater than that of the earth’s escape velocity
C

the gravitational effect of the moon
D

the earth’s magnetic field

Solution

The escape velocity of earth is approximately 11.2km/s. This is greater than the root-mean-square velocities of the atmospheric gases. Hence, the gases are unable to escape into the vacuum of space.

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