According to Graham's law of diffusion at a given temperature,the ratio of the rate of diffusion $r_A/r_B$ for 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
    $(P_B/P_A)(M_B/M_A)^{1/2}$

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