Easy
The atmosphere on a planet is possible only if [where $v_{rms}$ is the root mean square speed of gas molecules on the planet and $v_e$ is the escape speed on its surface]
- A$v_{rms} = v_e$
- B$v_{rms} > v_e$
- C$v_{rms} \leq v_e$
- D$v_{rms} < v_e$
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Difficult
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