The temperature of an ideal gas is reduced from $927^\circ C$ to $27^\circ C$. The $r.m.s.$ velocity of the molecules becomes
A
Double the initial value
B
Half of the initial value
C
Four times the initial value
D
Ten times the initial value
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B
Half of the initial value
b
temperature remains one fourth of the initial value
$(1200K\, = 927^\circ C \to 300K = 27^\circ C)$
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