An ideal gas 
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?
Text Solution
Verified by ExpertsThe correct answer is:
B
As, root mean square speed of gas molecule is 
or 
is to reduce two times, i.e. the temperature of the gas will have to reduce four times or
During adiabatic process, 
or 
Hence, gas has to be expanded to 16 times.
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