Physics - Fluid Question with Solution | TestHub

PhysicsFluidSurface TensionEasy2 minPYQ_2020
PhysicsEasysingle choice

A big water drop is formed by the combination ofnsmall water drops of equal radii. The ratio of the surface energy ofndrops to the surface energy of the big drop is

Options:

Answer:
D
Solution:

Volume of big drop =n(Volume of small drop)

43πR3=n.43πr3

R3=nr3

R=n13.r

E2=surface energy of n drops=n×4πr2×T

E1=surface of energy of big drop=4πR2T

∴  E 2 E 1 = n r 2 R 2 = n r 2 ( n 1 3 .r ) 2 = n r 2 n 2 3 . r 2 ∴  E 2 E 1 = n 1 3 = n 3  :1

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:FluidSubtopic:Surface Tension
⏱ 2mℹ️ Source: PYQ_2020

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