What will be the approximate terminal velocity of a rain drop of diameter 1.8 \times 10^{-3} {m}, when density of rain water \approx 10^{3} {kgm}^{-3} and the co-efficient of viscosity of air \approx .1 .8 \times 1 0^{-5} {Nsm}^{-2} ? (Neglect buoyancy of air).

WBJEE 2018 Physics Solved Paper

Question : 5 of 39

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What will be the approximate terminal velocity of a rain drop of diameter 1.8×10−3m, when density of rain water ≈103kgm−3 and the co-efficient of viscosity of air ≈.1.8× 10−5Nsm−2 ? (Neglect buoyancy of air).

49‌ms−1
98‌ms−1
392‌ms−1
980‌ms−1

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