Question

In figure, A and B are two adiabatic curves for two different gases. Then A and B corresponds to

• A. Ar and He respectively
• B. He and $H_2$ respectively
• C. $O_2$ and $H_2$ respectively
• D. $H_2$ and He respectively

Answer 1

The correct option is B He and $H_2$ respectively

$Y=\frac{C_P}{C_V}\to$ increases with atomicity, therefore, atomicity of $B>$ atomicity of A.

Among the given options,

Ar He $H_2$ $O_2$

1 1 2 2

$\therefore$ (B) is the correct option.

Atomicity of $H_2$ > Atomicity of $He.$

$\therefore$ Y of $H_2$ > Y of $He.$