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In the expression vS = 1.8 (g*d (G-1))^1/2, the diameter of spherical particle is ____________

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In the expression vS = 1.8 (g*d (G-1))^1/2, the diameter of spherical particle is ____________

(a) 0.1mm

(b) < 0.1mm

(c) 1mm

(d) >1mm

I have been asked this question at a job interview.

My query is from Types of Settling topic in chapter Sedimentation and Chemical Clarification of Environmental Engineering

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Right option is (d) >1mm

The explanation is: The settling velocity of spherical particle is given by stokes law and when the diameter d of spherical particle is > 1mm, settling velocity is given by  vS = 1.8 (g*d (G-1))^1/2  where G is the specific gravity of the particle.

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