For a gas `R/C_V` = 0.4, where R is the universal gas constant and C, is molar specific heat at constant volume. The gas is made up of molecules which are

Options

A. rigid diatomic
B. monoatomic
C. non-rigid diatomic
D. polyatomic

Answer

D

Explanation

According to question,
`R/C_V=0.4` [R= universal gas constant and `C_V`=molar specific heat at constant volume]
As we know, `C_P -C_V = R`
So, (C_P-C_V)/C_V=0.4 Rightarrow C_P/C_V=0.4+1=1.4`
i.e. Y=1.4
As Y = 1.4 ,the gas is diatomic in nature.