Question

The radius of a soap bubble is increased from cm to cm. The surface tension of water is 30 dynes per cm. If the work done required is α × 10–6 J then find the value of α.​

Answer 1

Answer:

W=8πT(r

2

2

−r

1

2

)=8πT[(

π

2

)

2

−(

π

1

)

2

]

∴W=8∗π∗30∗

π

3

=720 erg.