1. The problem statement, all variables and given/known data A 120-cm-long, 3.0 g string oscillates in its n = 4 mode with a frequency of 150 Hz and a maximum amplitude of 5.5 mm. Wavelength is 0.6 m. What is the tension in the string? 2. Relevant equations f = sqrt(TL/m)/2L 3. The attempt at a solution 150 = sqrt(1.2T/.003)/2.4 Solving for T gives me T = 324 Which, according to the program(Mastering Physics), is wrong. I'm not sure if this is the right equation, but its the only found I could find that uses all of the information I have, excluding amplitude.