MHT CET202210 Aug 2022Evening ShiftPhysicsMechanical Properties of FluidsActual

The excess pressure inside a soap bubble of radius 2 ~cm is 50 dyne / cm ^2 . The surface tension is

Options

A25 dyne / cm
B60 dyne/ cm
C50 dyne / cm
D75 dyne/ cm

Correct answer

A. 25 dyne / cm

Step-by-step solution

Given, Excess pressure, P=50 dyne / cm ^2 Radius, r=2 ~cm For a soap bubble liquid-air interface is crossed two times, so we have, Excess pressure, P= 4 T r , where T is the surface tension. T= P r 4 = 50 dyne / cm ^2 2 ~cm 4 =25 dyne / cm

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