An ideal gas \( (\gamma=1.5) \) is expanded adiabatically. How many times the gas has to be expa...

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An ideal gas \( (\gamma=1.5) \) is expanded adiabatically. How many times the gas has to be expanded to reduce the root mean square velocity of the molecules \( 2.0 \) times?
(a) 4 times
(b) 16 times
(c) 8 times
(d) 2 times
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