If there is a volume fraction f of particles all with a radius r the mean number of particles intersecting unit area of a random plane is_________

If there is a volume fraction f of particles all with a radius r the m

1.	If there is a volume fraction f of particles all with a radius r the mean number of particles intersecting unit area of a random plane is_________
A.	2f/ r<sup>2</sup>
B.	5f/ r<sup>2</sup>
C.	3f/ r<sup>2</sup>
D.	3f/2 r<sup>2</sup>
Answer» E.

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