If the planktonic organic materials may be assumed to be of spherical shape, when two microorganism of size 10^-3 and 10^-4 mm size diameter, which one will settle faster to the bottom of water 10 m deep, and how long will it take for the fast particle to settle. Assume the density as 1250 kg/m3 and the viscosity of water as 1.05 *10^-3 kg.m/s