Properties Of Solids And Liquids Question 336

Question: The radius of a soap bubble is increased from 1π cm to 2π cm. If the surface tension of water is 30 dynes per cm, then the work done will be[MP PMT 1986]

Options:

A) 180 ergs

B) 360 ergs

C) 720 ergs

D)960 ergs

Show Answer

Answer:

Correct Answer: C

Solution:

W=8πT(r22r12)

=8πT[(2π)2(1π)2] W = 8×π×30×3π

=720 erg



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