First slide

Surface tension

Question

The amount of work done in forming a soap bubble
(S.T. = 30 x 10^-3 N/m) of radius 5 cm is:

Moderate

A

$1.88 x 10^{- 3} J$
B

$1.88 x 10^{1} J$
C

$1.88 X 10^{- 1} J$
D

$1.88 X 10^{3} J$

Solution

$W = 8 {πR}^{2} T = 8 \times 3.14 \times {(5 \times 10^{- 2})}^{2} \times 30 \times 10^{- 3} = 1.88 \times 10^{- 3} J$

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