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Ah, so I was thinking that the voltage might change how ions are distributed the solution, and might therefore affect the sound wave. I'm curious about the question: when the voltage is switched on and then off, will there be a difference in the sound wave because of the way the charges are distributed?
My understanding is that sound is a traveling wave through a medium, so water molecules are bumping into each other as the wave travels. Is that correct? If there are charges in the water that are bumping around as well, and charges experience a force from nearby voltages, I'm wondering if the nearby charges in the water will experience a change in behavior, and transmit that change to the traveling wave.