Attach noise-maker to battery and insert into styrofoam ball (ball has large slit).
Toss ball (play catch with student volunteer) to hear change in pitch.
- Located in L02, section C-2
Touching both electrodes at the same time completes the circuit and causes the ball to light up. If one person touches one electrode and another person touches the other the ball will not light up; but if the two people then touch each other the ball will light up. A circuit chain consisting of multiple students can be created.