Raindrops of different radii are falling through air. The terminal vel

1.	Raindrops of different radii are falling through air. The terminal velocity of a drop of radius r will be proportional to (a) r3 (b) r2 (c) r (d) 1/r
Answer» Correct Answer is: (b) r² Terminal velocity is reached under the condition 6πηrv = 4/3 πr³ (ρ - σ)g where the symbols have their usual meanings. Thus, v ∝ r².

Raindrops of different radii are falling through air. The terminal velocity of a drop of radius r will be proportional to (a) r3 (b) r2 (c) r (d) 1/r

Answer»

Correct Answer is: (b) r²

Terminal velocity is reached under the condition

6πηrv = 4/3 πr³ (ρ - σ)g

where the symbols have their usual meanings. Thus, v ∝ r².