Properties Of Solids And Liquids Question 354

Question: 8000 identical water drops are combined to form a big drop. Then the ratio of the final surface energy to the initial surface energy of all the drops together is [EAMCET (Engg.) 2000]

Options:

A) 1 : 10

B)1 : 15

C) 1 : 20

D) 1 : 25

Show Answer

Answer:

Correct Answer: C

Solution:

As volume remains constant R3=8000r3

R=20r

Surface energy of one big dropSurface energy of 8000 small drop=4πR2T8000 4πr2T

=R28000r2=(20r)28000r2=120



NCERT Chapter Video Solution

Dual Pane