PVC Open Pipe Organ...Help!! 1. The problem statement, all variables and given/known data Urgent As part of an assignment, I need to create an open pipe organ that plays two different octaves. I don't know anything about octaves or music, but Google defines octave as : A series of eight notes occupying the interval between two notes, one having twice or half the frequency of vibration of the other. So, I need two different sets of eight notes, with each higher note double the frequency of the previous. I am constructing this with 2" PVC pipe from a local home improvement store. I plan on cutting the PVC into different segments to create each frequency. I'll hit the top of each PVC with a drumstick to create the sound (vibrations) needed to produce each frequency. So, octaves should I try to hit with the 2" PVC? I can also buy a different diameter PVC if necessary. I researched this and found the formula, but I still am a bit confused (again, I don't know anything about music). Does the plan sound right (hitting the top of each pipe segment with a drumstick? 2. Relevant equations Harmonic series of an open pipe organ Frequency = Harmonic number * (speed of sound in pipe)/2(length of vibrating air column) 3. The attempt at a solution How would I determine which harmonic number to use? My textbook didn't explain this well. Also, the speed of sound would be approximately 345m/s (we're on Earth) Which frequency would I attempt to achieve for each note? Also, how does the diameter of my pipe affect this? --> I don't see a place in the formula for you to change the diameter of each open pipe. Thanks in advance!