Calculate the ratio of average velocity of helium atoms at `27^@C` and methane molecules at `127^@C`.

Explanation

`( vecC_(1))/(vecC_(2)) = sqrt((T_1M_2)/(T_2 M_1))`
Substituting the values,
` ( vecC_1)/( vecC_2)= sqrt((300 xx 16 )/( 400 xx 4 )) = sqrt(3) = 1.73`
The ratio of average velocity of He and `CH_4 `=1.73:1