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Question
The surface tension of soap solution at a temperature 20o C is 2.5×10−2Nm−1. The excess pressure inside a bubble of soap solution of radius 6 mm is then
The surface tension of soap solution at a temperature 20o C is 2.5×10−2Nm−1. The excess pressure inside a bubble of soap solution of radius 6 mm is then
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Solution
The correct option is C 16.7 Pa
Here, surface tension, S=2.5×10−2Nm−1
r=6mm=6×10−3mP=?
Excess pressure inside the soap bubble,
P=4Sr=4×2.5×10−16×10−3=16.7Pa
Here, surface tension,
S=2.5×10−2Nm−1
r=6mm=6×10−3m
r=6mm=6×10−3m
P=?
Excess pressure inside the soap bubble,
P=4Sr
Excess pressure inside the soap bubble,
P=4Sr
=4×2.5×10−16×10−3=16.7Pa
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