First You See It, Then You Hear It

This First You See It, Then You Hear It activity & project also includes:

Light and sound go hand in hand. Pupils set up a system that will emit sound when a laser is directed at a photodiode. Various objects, such as a comb and talcum powder, allow for modulation of the laser beam. Individuals also investigate a second system where a laser is connected to a CD or cassette player—offering great practice and variety for the lesson!

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Instructional Ideas

  • Invite a sound engineer to give a presentation
Classroom Considerations

  • Activity requires some specialized materials, such as photodiodes
  • Instructors may need to take apart and reconnect the battery compartment of the laser pointer
Pros

  • Includes diagrams of the investigation setup
  • Lists some questions for discussion
Cons

  • None