Published by:
CGP EDU Academic Team
Published on: August 13, 2026
A gas cylinder contains a mixture of Helium (He) and Argon (Ar) atoms at a constant temperature of 300 K. Let 
and 
represent the root-mean-square (rms) speeds and 
and 
represent the average translational kinetic energies of the respective atoms. Which of the following relationships is correct?
A
and 
B
and 
C
and 
D
and 
Text Solution
Verified by ExpertsThe correct answer is:
C
Since both Helium (He) and Argon (Ar) atoms are at the same constant temperature (300 K)
Since Helium (He) has a smaller molar mass than Argon (Ar), at the same temperature,
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