Is it possible to achieve the same resonance frequency with smaller disc size?
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A. No, because the resonance frequency correlates with the dimension of the disks.
The smaller the disk diameter, the higher the radial mode resonance frequency
e.g. 5 mm 400 kHz
e.g. 10 mm 194 kHz
The thinner the disks, the higher the thickness mode resonance frequency
e.g. 1 mm 2 MHz
e.g. 2 mm 1 MHz