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Dust grains of diameter 0.83 µm and density 1000 kg/m3 are in equilibrium with air (A...

Dust grains of diameter 0.83 µm and density 1000 kg/m3 are in equilibrium with air (A = 28.9) at a temperature of 278 K . What is the rms speed of the dust particles? 1 m = 106µm. Answer in units of mm/s.

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