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
- 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$({M_A}/{M_B})({P_B}/{P_A})^{1/2}$
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