Firstly, assuming constant temperature and pressure. The speed of a sound wave in a medium is constant. For any wave, the speed of wave propagation is wavelength times frequency. If we keep increasing the frequency of sound to a ridiculously high value so that the corresponding wavelength is in the order of micro-meters. Would the resulting wave be considered a sound wave or a heat conduction?
Essentially the resulting wave is just vibrating the molecules mechanically instead of electromagnetically (think IR waves) with a similar wavelength.
If someone could make me picture/visualise the answer that would be great because I tend to be a visual learner. Thanks!
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> Would the resulting wave be considered a sound wave or a heat conduction?
When the frequency increases the material will more and more absorb the sound, transforming it into heat. This is used in [ultrasonic welding](https://en.wikipedia.org/wiki/Ultrasonic_welding).
So there’s no “wave” anymore.
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