Question

The ratio of average translatory kinetic energy of He gas molecules to $O_2$ gas molecule is

• A. $\frac{25}{21}$
• B. $\frac{21}{25}$
• C. $\frac{3}{2}$
• D. 1

Answer 1

The correct option is D 1

The average translational kinetic energy of gas molecules is given by

$K=\frac{3}{2}{k}_{B}T$

ratio, $\frac{K_{He}}{K_{O_2}}=\frac{3k_{B}T/2}{3k_{B}T/2}=1$

The correct option is D.