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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