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Q.

The terminal velocity of a rain drop of radius r falling down in the atmosphere is

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a

$\frac{2 r^{2} (ρ + ρ_{0}) g}{9 η}$

b

$\frac{2 r^{2} (ρ - ρ_{0}) g}{η}$

c

$\frac{2 r^{2} (ρ - ρ_{0}) g}{9 η}$

d

$\frac{2 r^{2} (ρ + ρ_{0}) g}{η}$

answer is A.

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Detailed Solution

$V = \frac{2}{9} \cdot \frac{r^{2} (ρ - ρ_{0}) g}{η}$

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