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Hold a piece of paper by one corner.Wave it around.What happens?

Place a ruler on a desk. Extend half of it over the edge of the desk. Hold one end of the ruler down,and tap the other end. What happens?

Wrap a rubber band around a bowl.Pluck the rubber band. What happens?

Our conclusion is........they all made sounds because of vibrations.

  • Plastic ruler
  • Cardboard box.
  • Rubber band
  • Paper