At `400` K, the root mean square (rms) speed of a gas X of molecular weight `40` is equal to the most probable speed of

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Q 1167701685.     At `400` K, the root mean square (rms) speed of a gas X of molecular weight `40` is equal to the most probable speed of gas Y at `60` K. Find the molecular weight of the gas `Y`.
JEE 2009
A

`12`

B

`2`

C

`8``

D

`4`

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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