(1) The rate at which a spherical particle will rise or fall when suspended in a liquid medium varies as the square of its radius; the density of the particle and the density and viscosity of the liquid are essential factors. Stokes's law is used in determining sedimentation of solids, creaming rate of fat particles in milk, etc.(2) In atomic processes, the wavelength of fluorescent radiation is always longer than that of the exciting radiation.
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