A) \[{{C}_{rms}}<<{{\upsilon }_{e}}\]
B) \[{{C}_{rms}}>{{\upsilon }_{e}}\]
C) The mass of density of planet is small
D) \[{{C}_{rms}}=0\]
Correct Answer: A
Solution :
At which planets rms velocity of molecule \[{{C}_{rms}}\]is less than escape velocity, atmosphere exists there \[{{c}_{rms}}\,<<{{\upsilon }_{e}}\]
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