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Spherical particles of pollen are shaken...

Spherical particles of pollen are shaken up in water and allowed to settle. The depth of water is `2xx10^(-2)m`. What is the diameter of the largest particles remaining in suspension one hour later?
Density of pollen `=1.8xx10^(3)kgm^(-3)` viscosity of water `=1xx10^(-2)` poise and density of water `=1xx10^(3)kgm^(-3)`

A

5.34 mm

B

1.77 mm

C

7.11 mm

D

3.54 mm

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