Properties Of Solids And Liquids Question 307

Question: The surface tension of soap solution is 25×103Nm1 .The excess pressure inside a soap bubble of diameter 1 cm is[AIIMS 1987]

Options:

A) 10 Pa

B) 20 Pa

C) 5 Pa

D)None of the above

Show Answer

Answer:

Correct Answer: B

Solution:

Excess pressure ΔP=4Tr

=4×2×25×1031×102

=20 N/m2=20 Pa

[as r=d2]



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