Find the difference of air pressure between the inside and outside of a soap bubble is 5mm in diameter, if the surface tension is `1.6 Nm^(-1)`.

Options

A. `2560 Nm^(-2)`
B. `3720 Nm^(-2)`
C. `1208 Nm^(-2)`
D. `10132 Nm^(-2)`

Answer

A

Explanation

The excess pressure p of bubble in air is given by
`p = (4S)/(R) = (4 xx 1.6)/(2.5 xx 10^(-3))`
`= 2560 Nm^(-2)`