3.1. Determine the radius of the gold hydrosol particle

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3.1. Determine the radius of the gold hydrosol particles if, after the diffusion-sedimentation equilibrium has been established at 293 K at a height of h = 8.56 cm, the particle concentration changes by a factor of e.
The density of gold is p = 19.3 g / cm3, the density of water is p0 = 1.0 g / cm3.