9. 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
(a) 100 dyne/cm
(b) 68.66 dyne/cm
(c) 137 dyne/cm
(d) 150 dyne/cm
Ans. b
(51)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)