The ratio of radii of two bubbles is 2 : 1 What is the ratio of excess pressures inside them?

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1 : 2

1 : 4

2 : 1

4 : 1

answer is A.

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Detailed Solution

The excess pressure inside the bubble,p=4Tr, then p1=4Tr1 …(i)and p2=4Tr2 …(ii)On dividing Eq. (i) by Eq. (ii), we getp1p2=4T/r14T/r2=r2r1=12

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