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Question
A soap bubble of diameter 4 mm is formed in air. The surface tension of liquid is 15 dyne/cm. The excess pressw·e inside the soap bubble is______.
Options
150 dyne/cm2
300 dyne/cm2
400 dyne/cm2
`3 xx 10^-3` dyne/cm2
MCQ
Fill in the Blanks
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Solution
A soap bubble of diameter 4 mm is formed in air. The surface tension of liquid is 15 dyne/cm. The excess pressw·e inside the soap bubble is 300 dyne/cm2.
Explanation:
P = `(4"T")/"r" = (4 xx 15)/ (2xx10^-1)= 300`dyne/cm2
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