Question

The atomic weight of helium is 4 times of hydrogen. Its rate of diffusion as compared to hydrogen is

(a) twice

(b) \(\frac 1 {\sqrt 2}\) times

(c) \(\sqrt 2\) times

(d) \(\frac 14\)th

Answer 1

Correct option is (b) \(\frac 1 {\sqrt 2}\)

\(\frac {r_{He}}{r_{H_2}} = \sqrt {\frac 24}= \frac1{\sqrt 2}\)