8.If youngs modulus of the material of a rod is Y and density is P then time taken by sound wave to travel L of length from bottom is------ Share with your friends Share 4 Neha Gupta answered this Let a is the area of the wire.L is the length of the wire.Volume of the wire is V.V = aLdensity of the wire = ρmass of the wire = ρV = ρaLweight of the wire will acts as the load for elongation= mg = ρaLgyoungs modulus is given b Y.Y = forceareachange in lengthlength = ρaLga∆LL∆L = ρL2gYtotal distance travelled = L+∆L = L+ρL2gY v is the velocity of the wavetime taken = L+ρL2gY v -4 View Full Answer