Tuning Forks and Beats
Two identical tuning forks
are placed together with open ends of the sound boxes facing each other.
- To demonstrate resonance and coupled oscillators, sound one, move
the boxes together, and then dampen the first one with your fingers.
The second will continue to hum.
- To demonstrate beats, put a couple of O-rings on one arm of a fork,
or start them both going with O-rings on one and not the other.