1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution if the material are the same in both strings, then the density should be the same. v = sqrt (tension/μ) tension in the first string should be 30 kg x 9.8 m/s^2 = 294 N next, v = λƒ and string#2 needs to have twice the frequency of string#1 and this is where I am stuck, don't know where to proceed from here do I need wavelength here? if so, how would i find it?