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NBerg
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I know, theoretically ultrasound has no upper limit (everything above 20kHz).. However, I was wondering whether on a practical note a maximum exists? I read somewhere that frequencies of the order 10^12 Hz were reached. Would a maximum frequency be based on the mean free path between the particles of a matter? Is there a direct relation with material density, i.e. more dense - smaller wavelength possible - higher frequency?