Math Frequencies and pitch experiment

Listen and make the straw flute at home:
as per this video...
https://www.youtube.com/watch?v=MWdKPZcqSCw

Frequency is inversely proportional to period duration
/.../.../.../.../.../.../.../.../
Is more frequent (has a higher frequency) than
/......./......./......./......./

Note:
The shorter/higher frequency has a higher pitch.

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