7. The number of particles crossing per unit area perpendicular to X-a

1.	7. The number of particles crossing per unit area perpendicular to X-axis inunit time is N=-D n2-n1/x2-x1. where n1 and n2 are number of particles perunit volume for the value of x1 and x2 respectively. The dimensions ofdiffusion constant Dare(a) M°LT power of 2(b) MºL power of 2 T power of -4(c) MÜLT power of 3O ()(d) M°L power of 2T power of 3
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