A flask contains Hydrogen and Argon in the ratio $2: 1$ by mass. The temperature of the mixture is $30^{\circ} C$. The ratio of average kinetic energy per molecule of the two gases ( $K$ argon/ $K$ hydrogen) is: (Given: Atomic Weight of $Ar = 39.9$)
A$1$
B$2$
C$\frac{39.9}{2}$
D$39.9$
JEE MAIN 2023, Medium
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A$1$
a Average $KE$ per molecule $=\frac{3}{2} kT$
$\frac{ K _{ AS }}{ K _{ H }}=\frac{1}{1}$
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