What does "The Thickness of the Element" refer to?

by The Thickness of the Element.

In a Facebook poll of 39 respondents, 89.7% chose “The size of the piezoelectric ceramic in the transducer that determines frequency.”. How we count

The size of the piezoelectric ceramic in the transducer that determines frequency.
89.7%
The depth, therefore width of the beam.
5.1%
The minimum lateral resolution of the system.
2.6%
I don't know, I thought it was a dick joke.
2.6%
The intensity at which electricity pulses the crystal in the transducer.
0%
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