According to Graham's law, at a given temperature, the ratio of the rates of diffusion `r_(A)//r_(B)` of gases `A` and `B` is given by

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

A