3. An ultramicroscopic study of silver hydrosol in a cell with an area of 5.4 μm2 and a light beam depth of 0.25 mm revealed two particles. Calculate the average length of the particle edge, taking their shape as cubic, if the sol concentration
C=0.2 g/l; and the density of silver is 10.5⋅10^3 g/cm3.

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