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The Sound Of Light


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The Sound Of Light

  1. 1. The Sound of Light Lillian Yanagawa Wade Nakamura Bryan Silver
  2. 2. Photoacoustic Effect • A G Bell discovered phenomenon in 1880s. • Light affects surface tension producing sound. • Technological advancements in the biomedical imaging field.
  3. 3. Hawaii Standards 3 • SC.PS.6.5 • Compare transverse and longitudinal waves and their properties • SC.PS.6.6 • Explain and provide examples of electromagnetic tradition and sound using a wave model.
  4. 4. Preliminary Observations: • Sound and light are forms of energy • Sound and light both produce waves • Sound waves are compressional (longitudinal) waves that require a medium to travel • Light waves are transverse waves that do not require a medium to travel • Visible Light exists in a larger spectrum from radio waves to gamma waves
  5. 5. Research Question: • Which wavelength(s) of the visible spectrum produce(s) sound?
  6. 6. Hypothesis: • If a photovoltaic cell is connected to a speaker/amplifier and exposed to the different spectra of visible light from infrared to ultraviolet, then the entire spectrum will produce sound, but the greatest decibel level will occur at the ultraviolet end of the spectrum, because the ultraviolet end of the spectrum is the most energetic.
  7. 7. Materials: • Amplifier/speaker Scissors • Vernier LabQuest D-battery Microprocessor Alligator clips • Microphone Prism • Photovoltaic cell Shade • Wire cork lead/connectors • Y-adapter • Motor • Pie plate
  8. 8. Procedure: • In three easy steps • Assemble apparatus
  9. 9. Procedure: • Obtain readings under • Red, white, and Black light • Repeat with prism outside − IR, red, green, blue, UV
  10. 10. Infra Red Light Sound
  11. 11. Red Light Sound
  12. 12. Green light sound
  13. 13. Blue Light Sound
  14. 14. Ultra Violet Light Sound
  15. 15. White light Sound
  16. 16. Conclusion: • Sound produced at all spectra of visible light • Intensity of sound varied by light wave • Loudest wave produced by UV • Hypothesis correct, higher energy light produces greater decibels.
  17. 17. Extension: • Using a 100w bulb and colored filters. • Use of a prism to separate sunlight. • Intensity of light in generating sound.