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Brownian Motion

Struggling with part e - could someone please explain why my volume equation is wrong.
MFP = 3.6x10^-7m
https://isaacphysics.org/questions/maths_ch7_1_q3?board=9933c242-5ca1-442a-96c6-a7f6e70e4b6f&stage=a_level
Working:

(I did multiply this by no. moles and avagadro constant)
(edited 1 month ago)
Nevermind - simple misunderstanding.
For anyone wondering its just area * MFP

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