Q.

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

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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 is B.

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Detailed Solution

ΔP=4Tr=40 N/m2
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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