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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Sound is a physiological phenomenon. In order for sound to happen, the air has to vibrate your eardrum, which is interpreted as sound. Without that step, it’s just vibration regardless of the medium.
As to your question about the frequency, vibration is a mechanical phenomena and not heat, which is the transfer of energy between two objects of different temperatures. Mechanical vibration might cause a change in temperature, but it’s not equivalent.
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