Question

answer it quickly.........

Answer 1

HELLO THERE!

N is the number of particles per unit area per unit time, so dimensions of N = [L⁻²T⁻¹].

N₂ and N₁ are number of particles per unit volume, so their dimensions = [L³].

Z₁ and Z₂ are distances, so their dimensions = [L]

According to the principle of homogeneity,

an equation holds true when Dimensions of Left hand side equals dimensions of right hand side.

Dimensions of right hand side =

$\frac{[L^{-2}T^{-1}][L]}{[L^{-3}]}$

= [L²T⁻¹].

So, dimensions of Diffusion constant D is [M⁰L²T⁻¹]