First slide

Surface tension

Question

Work done to blow a bubble of volume V is W. The work done in blowing a bubble of volume 2 V will be

Easy

A

${(2)}^{1 / 3} W$
B

2W
C

$(4)^{1 / 3} W$
D

4W

Solution

$W_{1} = 4 {πr}_{1}^{2} T and W_{2} = 4 {πr}_{2}^{2} T ∴ \frac{W_{2}}{W_{1}} = \frac{r_{2}^{2}}{r_{1}^{2}} = {[{(\frac{r_{2}^{3}}{r_{1}^{3}})}^{1 / 3}]}^{2} = {(\frac{V_{2}}{V_{1}})}^{2 / 3} = (2)^{2 / 3} = (4)^{1 / 3} Now W_{1} = W . Hence W_{2} = (4)^{1 / 3} W$

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