According to Graham's law, at a given temperature the ratio of diffusion `r_A/r_B` of gases A and B is given by
(where P and M are pressures and molecular weights of gases A and B respectively)

Options

A. `(p_(A)//p_(B)) (M_(A)//M_(B))^(1//2)`
B. `(M_(A)//M_(B)) (p_(A)//p_(B))^(1//2)`
C. `(p_(A)//p_(B)) (M_(B)//M_(A))^(1//2)`
D. `(M_(A)//M_(B)) (p_(B)//P_(A))^(1//2)`

Answer

C

Explanation

`(r_(A))/(r_(B)) = (P_(A))/(P_(B)) sqrt((M_(B))/(M_(A)))`