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Question: If the surface tension of a soap solution is 0.03 MKS units, then the excess of pressure inside a so...

If the surface tension of a soap solution is 0.03 MKS units, then the excess of pressure inside a soap bubble of diameter 6 mm over the atmospheric pressure will be

A

Less than 40 N/m2

B

Greater than 40 N/m2

C

Less than 20 N/m2

D

Greater than 20 N/m2

Answer

Greater than 40 N/m2

Explanation

Solution

ΔP=4Tr=40 N/m2\Delta P = \frac { 4 T } { r } = 40 \mathrm {~N} / \mathrm { m } ^ { 2 }