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MHT CET 2021 (24 Sep, Shift 2) · Surface Energy & Work Done

Surface Energy & Work Done question from MHT CET 2021 (24 Sep, Shift 2)

Q25MHT CET 2021 · 24 SEP · SHIFT 2Medium

Surface Energy & Work Done

If the work done in blowing a soap bubble of volume ' $V$ ' is ' $W$ ', then the work done in blowing a soap bubble of volume ' $2V$ ' will be

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Answer: (b)

$W \propto r^2$ and $r \propto V^{1/3}$ , so $W \propto V^{2/3}$ .
$W' = 2^{2/3} W = (4)^{1/3} W$
So the answer is (b) $(4)^{1/3}W$ .

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