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MHT CET 2021 (24 Sep, Shift 1) · Surface Energy & Work Done

Surface Energy & Work Done question from MHT CET 2021 (24 Sep, Shift 1)

Q26MHT CET 2021 · 24 SEP · SHIFT 1Medium

Surface Energy & Work Done

The work done in blowing a soap bubble of volume ' $V$ ' is ' $W$ '. The work required to blow a soap bubble of volume ' $2V$ ' is [ $T =$ surface tension of soap solution]

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Answer: (a)

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

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