First slide

Surface tension

Question

What change in surface energy will be noticed when a drop of radius ff splits up into 1000 droplets of radius r. Surface tension is T.

Easy

A

$4 {πR}^{2} T$
B

$7 {πR}^{2} T$
C

$16 {πR}^{2} T$
D

$36 {πR}^{2} T$

Solution

we know that
$W = 4 {πR}^{2} [n^{1 / 3} - 1] T = 4 {πR}^{2} [(1000)^{1 / 3} - 1] T = 4 {πR}^{2} \times 9 T = 36 {πR}^{2} T$

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