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**PVC Open Pipe Organ...Help!!**

## Homework Statement

**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?

## Homework Equations

**Harmonic series of an open pipe organ**

Frequency = Harmonic number * (speed of sound in pipe)/2(length of vibrating air column)

## 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!

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