The volume of an ideal gas increases 8 times and temperature becomes 
of initial temperature during a reversible change. If there is no exchange of heat in this process ( 
) then identify the gas from the following options (Assuming the gases given in the options are ideal gases):
Text Solution
Verified by ExpertsD
For an adiabatic process ( 
) with an ideal gas: 
Given: 
and 
Applying the adiabatic relation:
This value corresponds to a monatomic gas. Among the options, only He is monatomic ( 
for monatomic ideal gases). 
and 
are diatomic ( 
), 
is polyatomic ( 
), and 
is polyatomic.
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