Photoelectric EffectHard

Question

If work done in increasing the size of a soap film from 10cm × 6cm × 11cm is 2 × 10-4 J What is the surface tension ?

Options

A.2 × 10-8 N/ m-1
B.2 × 10-2 N/ m-1
C.2 × 10-4 N/ m-1
D.none of these

Solution

Work done = Increases in surface area × Surface tension
22 × 10-4 =
T = ×10-2Nm-1

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