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Whith that in mind, I have read theMaybe this helps: Take a string (or twine or cord) and a thicker rope (like hemp) and tie them together. Tie one end to a wall (or hold it tightly). One can shake the other end, and if done carefully, one can see that the pulses in both media have the same frequency, but different wavelengths.
various explanations of the physics of sound crossing a boundary... I urge
others to reread these explanations from a similar viewpoint and see if
they can't come up with more picturesque and compelling explanations.
p.s. I wonder is there is an acoustical frequency doubling, etc.Yes, there are nonlinear effects in acoustical waves; in this case period doubling ("sub-harmonics") can also occur: It can be heard if one carefully bows a string using a large bow pressure.
analogous to that in optical non-linear crystals?