Code Number: 3C20.43

Demo Title: Coin in a Balloon

Condition: Good

Principle: Frequency of Sound Waves

Area of Study: Oscillations &Acoustics

Equipment:

Balloons, Quarters or Dimes.

Procedure:

Put a dime or a quarter in a balloon. Blow the balloon up and tie it off. Rotate the balloon so that the coin starts to travel in a circle inside the balloon. The edges of the coin on the balloon will create a sound whose frequency depends on the velocity of the coin inside the balloon.

References:

Bobby Mercer, "Rubber Maraca", Junk Drawer Physics, p. 69.

Disclaimer

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Instructional Resources and Lecture Demonstrations

3C20.43 - Coin in a Balloon

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