Spring 2015

Sound, light, and waves

March 21, 2015 at Long Beach City College

Sponsored by SCAAPT and the Brown Foundation

James

Bill

  • Bill's handouts are available for download at the bottom of the page
  • Rulers illustrating 2-source interference

Kevin

Cliff

  • DIY standing wave demo machine
  • "Doppler ball" to swing around your head

Frank

  • Definition of a wave
  • Activity: Drawing waves (wave equation)
  • Video (using beats to tune a guitar): "Tuning Without a Tuner Part 2"
  • Resonance and beats tuning forks in boxes, catalog link
  • Video, classic example of resonance, Tacoma Narrows Bridge (some argue its collapse was caused by some other phenomena): https://www.youtube.com/watch?v=j-zczJXSxnw
  • Video on infrared on FLIR's website
  • For the speed of sound lab (using echoes), I realize there's a concern of obtaining computers for the sound wave analysis. In middle of one of the lab rotations, we discovered you can record and analyze the sound using smartphone apps! Thanks to Jared for finding out this can be done on the TwistedWave Recorder free app for iPhone! For those with Android devices, you can use WavePad Audio Editor Free. Both apps allow you to record sound in the app and allow you to analyze time to 0.001 seconds. I haven't tested these out myself in terms of recording echoes, so the only potential trouble I see is different phones have different mic sensitivities and hopefully they all pick up the relatively faint echo.

Resources/Software/Websites/Apps

  • Audacity - Software to analyze, generate, and edit sound files (Windows/Mac)
  • onlinetonegenerator.com
  • Signal Generator for Windows
  • Pro Audio Tone Generator by Dutchmatic (simple tone generator for Android)
  • Function Generator by keuwlsoft (more feature-rich tone generator for Android)
  • Signal Gen (iTunes App Store)
  • TwistedWave Recorder (Free, iTunes App Store) - Audio editor for iPhone/iPad, can be used to analyze time (for speed of sound)
  • WavePad Audio Editor Free - Audio editor for Android, can be used to analyze time (for speed of sound)
One of our participants, Micah, also mentioned that you can get FREE Nobel Posters from Sweden!
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Frank Lee,
Mar 21, 2015, 9:40 AM
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Frank Lee,
Mar 21, 2015, 11:44 PM
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Frank Lee,
Mar 19, 2015, 7:27 PM
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Frank Lee,
Mar 21, 2015, 8:27 AM
ĉ
Frank Lee,
Mar 19, 2015, 7:27 PM
ĉ
Frank Lee,
Mar 19, 2015, 7:27 PM
ĉ
Frank Lee,
Mar 19, 2015, 7:27 PM
ĉ
Frank Lee,
Mar 19, 2015, 7:27 PM
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Frank Lee,
Mar 21, 2015, 10:35 AM