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MHT CET 2023 (13 May, Shift 2) · Surface Energy & Work Done

Surface Energy & Work Done question from MHT CET 2023 (13 May, Shift 2)

Q17MHT CET 2023 · 13 MAY · SHIFT 2Medium

Surface Energy & Work Done

If work done in blowing a soap bubble of volume $V$ is $W$ , then the work done in blowing the bubble of volume $2V$ from same soap is

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Answer: (d)

$W = 8\pi r^2 T \propto r^2$ and $V \propto r^3$ , so $W \propto V^{2/3}$ .
$\dfrac{W'}{W} = 2^{2/3} = (4)^{1/3}$
So the answer is (d) $(4)^{1/3}W$ .

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