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You might mean a device also known as the (Alexander Graham) Bell water microphone.
Sound waves impinging on a diaphragm connected to a needle cause the needle to move up and down in a weak acid solution. The variation in the resistance of the device as measured from the needle to the outside of the container of acid solution gives the microphone effect.
What matters is the amount of variation in resistance given the level of sound variation.
Therefore, the dependent variable would be some measure of the amount of variation in level of resistance of the device.
There are many possible independent variables, including:
- sound frequency
- dilution of the acid solution
- diameter of the needle
- diameter and circumference of the diaphragm
- strength of the sound
- circumference of the container for the needle
- viscosity of the solution
What else can I help you with?
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