A batch settling experiment is performed in a long column using a dilute dispersion containing equal number of particles of type $A$ and type $B$ in water (density $1000 \text{ kg m}^{-3}$) at room temperature.

Type $A$ are spherical particles of diameter $30\: \mu m$ and density $1100 \text{ kg m}^{-3}$.

Type $B$ are spherical particles of diameter $10\: \mu m$ and density $1900 \text{ kg m}^{-3}$.

Assuming that Stokes’ law is valid throughout the duration of the experiment, the settled bed would

1. consist of a homogeneous mixture of type $A$ and type $B$ particles
2. consists of type $B$ particles only
3. be completely segregated with type $B$ particles on top of type $A$ particles
4. be completely segregated with type $A$ particles on top of type $B$ particles
in Others
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