Properties Of Solids And Liquids Question 310

Question: The pressure of air in a soap bubble of 0.7cm diameter is 8 mm of water above the pressure outside. The surface tension of the soap solution is [MP PET 1991; MP PMT 1997]

Options:

A) 100dyne/cm

B) 68.66dyne/cm

C) 137dyne/cm

D)150dyne/cm

Show Answer

Answer:

Correct Answer: B

Solution:

ΔP=4Tr=hdgT=rhdg4

=0.35×0.8×1×1034

=70 dyne/cm

68.66 dyne/cm



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