The surface tension of soap solution at a temperature `20^(@)`C is `2.5xx10^(-2) N m^(-1)`.The excess pressure inside a bubble of soap solution of radius 6mm is

Options

A. 12.5 pa
B. 14.2 pa
C. 15.5 pa
D. 16.7 pa

Answer

D

Explanation

Here, surface tension , `S=2.5xx10^(-2) N m^(-1)`
`r=6`mm`=6xx10^(-3)`m
Excess pressure inside the soap bubble,
`P=(4S)/(r)=(4xx2.5xx10^(-2))/(6xx10^(-3))=16.7` Pa