What must be the stress `(F//A)` in a stretched wire of a material whose Young's modulus is `Y` for the speed of lonitudinal waves equal to `30` times the speed of transverese waves?

Explanation

`sqrt((Y)/(rho)) = 30 sqrt((T)/(mu)) = 30 sqrt((F)/(rho P))` (as `T = F` and `mu = rhoA`)
:. `(F)/(A) = (Y)/(900)`s