One mole of an ideal gas has an interal energy given by `U=U_(0)+2PV` , where `P` is the pressure and `V` the volume of the gas. `U_(0)` is a constant. This gas undergoes the quasi`-` static cyclic process `ABCD` as shown in the `U-V` diagram.

The gas must be

Options

A. monatomic
B. diatomic
C. a mixture of mono and diatomic gases
D. a mixture of di`-` and tri`-` atomic gases

Answer

C

Explanation

`C_(V)=2R`, which is between the `C_(V)` values of mono and diatomic gases.