If the r.m.s. speed of chlorine molecule is $490\,m / s$ at $27^{\circ}\,C$, the r.m.s. speed of argon molecules at the same temperature will be $......\,m/s$ (Atomic mass of argon $=39.9\,u$, molecular mass of chlorine $=70.9\,u )$
JEE MAIN 2023, Easy
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