For a gas $\frac{R}{{{C_V}}} = 0.67$. This gas is made up of molecules which are
A
Diatomic
B
Mixture of diatomic and polyatomic molecules
C
Monoatomic
D
Polyatomic
AIPMT 1992, Easy
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C
Monoatomic
c $C_{v} =\frac{f}{2} R=\frac{1}{0.67} R$
$f =\frac{2}{0.67}=3$
Hence the gas is monoatomic.
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$Assertion :$ The root mean square and most probable speeds of the molecules in a gas are the same.
$Reason :$ The Maxwell distribution for the speed of molecules in a gas in symmetrical.
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