Questions
The earth is able to retain its atmosphere because of
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
detailed solution
Correct option is A
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.Talk to our academic expert!
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