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Surface Energy

The energy re...

Question

The energy required to blow a bubble of radius 4 cm and 3 cm in the same liquid is in the ratio of

A

4 : 3

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B

3 : 4

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C

16 : 9

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D

64 : 27

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Solution

The correct option is C 3 : 4
From Tension,
$T \propto 1 / r$
and energy $\propto$ force
$\Rightarrow$ Energy $\propto 1 / r$
$\Rightarrow$ Energy required to blow a
bubble of radius 4 cm and 3 cm
in the ration of 3 : 4.

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