Answer:
The typical size of the suspended particles should be \[{{10}^{-6}}m\]. If the size of the suspended particles is too small \[(\approx {{10}^{-10}}m),\] the net momentum imparted to the suspended particle due to bombardment of neigh- bouring fluid particles would be zero and hence no Brownian motion is possible. If the size of the suspended particle is too large \[\text{(}\approx \text{1m),}\] the particle will not move due to its large inertia, even when an unbalanced force is acting on it.
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