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

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/πr2
B.	5f/πr2
C.	3f/πr2
D.	3f/2πr2
Answer» E.

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