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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

(45)

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(a)      – 5 J (b)  – 10 J (c)   – 15 J (d)  – 20 J Answer-a (118)

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