Question

The use of Stokes’ law for measurement of the size of soil particle depends on certain simplifying assumptions. These are:
A. Particles must be spherical, smooth and rigid
B. Fall must be unhindered
C. Particles must be uniform density
D. Size of particles must be small compared to the size of molecules of liquid Choose the correct answer from the options given below:

A A, B and D only
B A, B and C only
C A, C and D only
D B, C and D only
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