While being accosted by the various electrostatic discharges a person experiences in life, I have noticed that the pitch and timbre of their sound varies greatly.
What factors determine these properties of a spark's sound?
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According to Fig. 3 of https://hal.archives-ouvertes.fr/hal-00810828/document , it looks like the average frequency of sound from a spark decreases (the average period increases) as the gap between the electrodes increases.