103. Mean square shift in the Brownian motion of nanoparticles of barium sulfate hydrosol 1.42•10–11 m2 for an observation time of 7 s at a temperature of 20 °C. Determine the mass of the hydrosol particle, knowing the viscosity of the medium 1.002•10–3 Pa•s. Assume that the shape of the particles is spherical, the density of barium sulfate is 4.50 g/cm3.
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