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!

Concepts

engineering design, light, electricity, energy conversion, technology resources

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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