When Sequoia measured the sound from the tube open at both ends, the Fourier transform plot looked very noisy and had a lot of peaks spread out all over the graph window. She should, Solution Initially it may take many trials to get a good pattern The important thing to get good pattern is to be sure to strike the tube after her Labmate has hit the green button to record. This will help in getting good data that is fourier transform with equally spaced peaks So last one is right option to choose .