A water drop of radius 1 $\mu$m falls in a situation where the effect of buoyant force is negligible. Co-efficient of viscosity of air is 1.8 $\times$ 10$-$5 Nsm$-$2 and its density is negligible as compared to that of water 106 gm$-$3. Terminal velocity of the water drop is : (Take acceleration due to gravity = 10 ms$-$2)

Question

A water drop of radius 1 $\mu$m falls in a situation where the effect of buoyant force is negligible. Co-efficient of viscosity of air is 1.8 $\times$ 10^$-$5 Nsm^$-$2 and its density is negligible as compared to that of water 10⁶ gm^$-$3. Terminal velocity of the water drop is :

(Take acceleration due to gravity = 10 ms^$-$2)

145.4 $\times$ 10^$-$6 ms^$-$1

118.0 $\times$ 10^$-$6 ms^$-$1

132.6 $\times$ 10^$-$6 ms^$-$1

123.4 $\times$ 10^$-$6 ms^$-$1

Solution

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