1. The problem statement, all variables and given/known data A tuning fork is in a hall 47.0 m long, and is placed 14.0 m from one end. It generates a tone of 246Hz. What is the phase difference when the waves traveling in each direction bounce back and meet each other? 2. Relevant equations Calculated wavelength with 343/246. Also tried 2pi*38m/1.39m = phi. Also maybe (cos phi/2)sin(kx-omega*t+phi/2) 3. The attempt at a solution Well, I figured that I could make it simple, calculate the wavelength, divide the difference in distance traveled by wavelengths, getting 27.4 waves, and then multiply .4 * 360 to get things into degrees. This gives me 144 degrees, but the answer in the back of the book is 91.3 degrees. What am I doing wrong? Thanks in advance.