1. The problem statement, all variables and given/known data A rubber string when unstretched has length L_{0} and mass per unit length μ_{0}. It is clamped by its ends and stretched by ΔL. The tension is T=κΔL / L_{0}. Show that the wave speed on the rubber string when stretched by ΔL is 1/L_{0} √( (κ/μ_{0}) ΔL(L_{0}+ΔL) ) 2. Relevant equations c = √(T/μ) δ^{2}y/δx^{2} = 1/c^{2} δ^{2}y/δt^{2} 3. The attempt at a solution Using the formula c = √(T/μ) and putting in T I get: c = √( κΔL/L_{0}μ_{0} ) but I am not sure how to arrive at the answer or whether this is correct? Many thanks.