HSC Science (Electronics) 12th Board ExamMaharashtra State Board
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# A Soap Bubble of Radius 12 Cm is Blown. Surface Tension of Soap Solution is 30 Dyne/Cm. Calculate the Work Done in Blowing the Soap Bubble. - HSC Science (Electronics) 12th Board Exam - Physics

#### Question

A soap bubble of radius 12 cm is blown. Surface tension of soap solution is 30 dyne/cm. Calculate the work done in blowing the soap bubble.

#### Solution

r = 12 cm, T = 30 dyne/cm, W = ?

Initial surface area of soap bubble = 0

Final surface area ΔA = 2 × 4πr2

∴ Increase in surface area = 2 × 4πr2

∴ Work done W = T × ΔA

= 30 × 8 × 3.14 × (12)2

= 108518.4 erg

= 108518.4 × 10−7

= 1.085 × 10−2 J

The work done in blowing the soap bubble is 1.085 × 10−2 J.

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#### APPEARS IN

2012-2013 (October) (with solutions)
Question 1.2 | 7.00 marks

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Solution A Soap Bubble of Radius 12 Cm is Blown. Surface Tension of Soap Solution is 30 Dyne/Cm. Calculate the Work Done in Blowing the Soap Bubble. Concept: Capillarity and Capillary Action.
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