When temperature of an ideal gas is increased from $27^\circ C$ to $227^\circ C$, its $r.m.s.$ speed changed from $400\, metre/sec$ to ${V_s}.$ The ${V_s}$ is ........ $metre/sec$
A$516$
B$450$
C$310$
D$746$
Medium
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A$516$
a $\frac{{{v_2}}}{{{v_1}}} = \sqrt {\frac{{{T_2}}}{{{T_1}}}} $
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