1.

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

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\(\frac{r_1}{r_2}= \sqrt\frac{M_2}{M_1}\\\frac{r_1}{r_2} = \sqrt\frac{2x}{8x}\\\frac{r_1}{r_2}=\sqrt\frac{1}{4}\\\frac{r_1}{r_2}=\frac{1}{2}\)

Hence rate of diffusion of hydrogen is 2 times of  helium (i:e) r2 = 2r1



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