Q. If $V_{H},V_{N}$ and $V_{0}$ denote the root –mean square velocities of molecules of hydrogen, nitrogen and oxygen respectively at a given temperature, then
A) $V_{N} > V_{O} > V_{H}$
B) $V_{H} > V_{N} > V_{O}$
C) $V_{O} = V_{N} = V_{H}$
D) $V_{O} > V_{H} > V_{N}$
Explanation
(b) $v_{rms} \propto \frac{1}{\sqrt{M}} \Rightarrow V_{H} > V_{N} > V_{O}\ \ \lbrack\because M_{H} < M_{N} < M_{O}\rbrack$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.