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CGP EDU Academic Team
Published on: September 12, 2026
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)
Text Solution
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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