1. The problem statement, all variables and given/known data A rubber string when unstretched has length L0 and mass per unit length μ0. It is clamped by its ends and stretched by ΔL. The tension is T=κΔL / L0. Show that the wave speed on the rubber string when stretched by ΔL is 1/L0 √( (κ/μ0) ΔL(L0+ΔL) ) 2. Relevant equations c = √(T/μ) δ2y/δx2 = 1/c2 δ2y/δt2 3. The attempt at a solution Using the formula c = √(T/μ) and putting in T I get: c = √( κΔL/L0μ0 ) but I am not sure how to arrive at the answer or whether this is correct? Many thanks.