The specific surface of spherical particles is given by (where D and $$\rho $$ are diameter and density of particle).
A. $$\frac{6}{{{\text{D}}.\rho }}$$
B. $$\frac{2}{{{\text{D}}.\rho }}$$
C. $$\frac{4}{{{\text{D}}.\rho }}$$
D. $$\frac{{12}}{{{\text{D}}.\rho }}$$
Answer: Option A

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