First slide

Surface tension

Question

A soap bubble (surface tension 30 dyne/cm) has a radius of 2 cm. The work done in doubling its radius is:

Moderate

A

zero
B

2261 erg
C

1135.5 erg
D

9043 erg

Solution

W = 8 $\times π \times (4 R^{2} - 3 R^{2}) \times T$ = 24 $π R^{2} T$ = 9043 erg

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