If the surface tension of solution of soap in wateris 35 dyenes/cm,calculate the work done to form an soap bubble of diameter 14 mm with that solution.

If the surface tension of solution of soap in wateris 35 dyenes/cm,cal

1.	If the surface tension of solution of soap in wateris 35 dyenes/cm,calculate the work done to form an soap bubble of diameter 14 mm with that solution.
Answer» Solution :SURFACE tension `S=35"dyne"CM^(-1)=0.035Nm^(-1)` Radius of the bubble `(r)=(14mm)/2=7mm` `=7XX10^(-3)m` `W=A(S)=8pir^(2)SimpliesW=8xx22/7xx49xx10^(-6)xx0.035` `W=4.312xx10^(-6)J`