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Question

At what absolute temperature T , is the root mean square speed of a hydrogen molecule equal to its escape velocity from the surface of the moon? The radius of moon is R, g is the acceleration due to gravity on moon's surface, m is the mass of hydrogen molecule and "k" is the Boltzmann constant

A
mgR2k
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B
2mgRk
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C
3mgR2k
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D
2mgR3k
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Solution

The correct option is D 2mgR3k
Vrms=3kTm
VC=2gR
3kTm=2gR
T=2mgR3k

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