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A soap bubble of radius 4 cm and surface...

A soap bubble of radius 4 cm and surface tension 30 dyne `cm^(-1)` is blown at the end of a tube of length 10 cm and intenal radius `0.2 cm` If the viscosity of air is `1.89xx10^(-4)` poise, Find the time taken by the bubble to be reduced ota radius of 2 cm.

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