1. The problem statement, all variables and given/known data A room is 4m wide in the x direction, ignore the y and z directions. Compute the longest sound wave that can occur in the room and its frequency. 2. Relevant equations speed of sound = 350 m/s λ = speed/frequency 3. The attempt at a solution Since the room is 4m wide and sound is a stationary wave, the longest wavelength that can occur is 4m. λ = 4m frequency = speed/λ = 350/4 = 87.5 Hz This just seems incredibly simple, is there anything I'm missing?