The surface tension of soap solution is 0.03 N/m. The work done in blowing to form a soap

The Surface Tension Of Soap Solution Is 003 Nm The Physics QuestionThe Surface Tension Of Soap Solution Is 003 Nm The Physics Question

The surface tension of soap solution is 0.03 N/m. The work done in blowing to form a soap bubble of surface area 40 cm², in joules is

Options

(a) 1.2×10⁻⁴
(b) 2.4×10⁻⁴
(c) 12×10⁻⁴
(d) 24×10⁻⁴

Correct Answer:

2.4×10⁻⁴

Explanation:

Given: Surface tension of a soap solution,
T = 0.03 N/m
Surface area, A = 40 cm² = 40 x 10⁻⁴ m²
Since the soap has two surfaces,
.·. Work done, W = T x 24
= 0.03 x 2 40 x 10⁻⁴ = 2.4 x 10⁻⁴J

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