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5. A drop of ink is gently deposited in a large volume of motionless water and initially has a radius of 1 mm. After 2 s the ink
drop has diffused into a spherical ball with radius 3 mm. How long will it take the ball to diffuse from a radius of 1 mm to
a radius of 11 mm (in s)? [All distances are root-mean-square averages.]
(A) 8
(B) 15
(C) 20
(D) 35
(E) 50

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