A soap bubble is blown to a diameter of 7 cm .36960 erg of work is done in blowing it further. If surface tension of soap solution is 40 dyne / cm then the new radius is______ cm Take ( π = 7 22 )

Question

A soap bubble is blown to a diameter of 7 cm .36960 erg of work is done in blowing it further. If surface tension of soap solution is 40 dyne / cm then the new radius is______ cm Take ( π = 7 22 ​ )

TestHub · Accepted Answer

​ ω = Δ U = S Δ A 36960 erg = cm 40 dyne ​ 8 π [ ( r ) 2 − ( 2 7 ​ ) 2 ] cm 2 r = 7 cm ​

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