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**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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Topics: Properties of Bulk Matter
(130)

Subject: Physics
(2479)

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