At what temperature is the root mean square speed of an atom in an argon gas cylinder equal to the rms speed of helium gas atom at –20°C ? (Atomic mass of Ar = 39 u and He = 400 u)
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Verified by ExpertsThe correct answer is:
A
Let 1 and 2 represent for Argon atom and Helium atom.
rms speed of Argon 
rms speed of Helium , 
According to questions, 
or 
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