The radius of a spherical soap bubble is 0·5 mm. If the surface tension of the soap solution be 30 dyne/ cm, the excess pressure is :

Options

A. `1500` dyne/c`m^(2)`
B. `1000` dyne/c`m^(2)`
C. `2400` dyne` /cm^(2)`
D. `1200` dyne `//cm^(2)`

Answer

C

Explanation

For soap bubble, excess pressure is
`P_(i)-P_(0)=(4T)/r`
`=(4xx30)/(0.5xx10^(-1))=2400` dyne/c`m^(2)`
So the correct choice is (c).