First slide

Surface tension and surface energy

Question

A drop of liquid of diameter 2.8 mm breaks up into 125 identical drops. The change in energy is nearly (S.T. of liquid =75 dynes/cm)

Moderate

A

Zero
B

19 erg
C

46 erg
D

74 erg

Solution

$\begin{array}{l} E = 4 {πR}^{2} T (n^{1 / 3} - 1) \\ = 4 \times 3 .14 \times {(1 .4 \times 10^{- 1})}^{2} \times 75 (125^{1 / 3} - 1) = 74 erg \end{array}$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App