Experiment With Sound Waves

What You Need:

  • Metal spoon
  • 30 inches of kite string (40 inches for an adult)

What You Do:

  1. Tie the handle of the spoon at the midpoint of the string.
  2. Wrap the ends of the string around your index fingers (pointer fingers).
  3. Place your fingers in your ears.
  4. Lean over so that spoon hangs freely and swing the spoon so it taps against a door.
  5. Hit the door again, this time harder.

What did you hear? Was it a soft sound like a bell, and then a louder sound like a church bell? The sound came because the spoon vibrated, causing sound waves to travel up the string and into your ears. The loudness or quietness of the sound depends on the amplitude (height of the wave).

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