Let’s say that two objects collide and reproduce a sound with a given frequency or frequencies, what properties of these two solids determine the frequency or frequencies produced ?
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1$\begingroup$ Do you want the sound produced inside the two objects, or do you want the sound that propagates away from the two objects? Because if it's the latter, the properties of the medium surrounding the objects are also relevant. $\endgroup$– probably_someoneCommented Mar 4, 2020 at 15:01
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There are probably more sources of sound than I will discuss here, but as a starting point...
Consider a tuning fork hitting the edge of a table. The frequency of the sound produced by the tuning fork is a function of its stiffness and mass. The tuning fork will vibrate at its fundamental frequency, but there will also be a small amount of sound at its overtones.
Sound could also be created by the displacement of air caused by the "shape" of the collision. For example, experiment with clapping your hands in different ways. You can get different frequencies depending on how much you "cup" your palms.
