Question: A radioactive dust particle approximates a sphere with a density of 2400 kg/m3. How long, in days, will it take the particle to settle to

A radioactive dust particle approximates a sphere with a density of 2400 kg/m3. How long, in days, will it take the particle to settle to sea level from 12 km altitude if the particle diameter is (a) 1 μ m; (b) 20 μ m?

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