Electric Guitar Science Fair Projects

What is the difference between the Piezo? (Electrical, intercom, pulse, etc)?
I Science Fair project in which I'll make a guitar pickup using a piezoelectric vibrator, but I went on the website of Radio Shack and there are many different pieces. Is there any difference between them? "I can use any of them to pick up the guitar? Thank you.
The piezoelectric effect is where the pressure and vibrations in crystals or ceramic materials to generate electricity, however, when the electric charge induced change shape or vibrations generated AC. So yes, the effect is reversible, and can use a reverse piezoelectric speaker as a spike. It is appropriate depends on the mechanical fasteners.
ambidextra 3 NEW SCIENCES inverted machines opposite motion
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