week 4a - Physics 1240 Today: Wave motion Tuesday 2/1/11...

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Physics 1240 Tuesday 2/1/11 Today: Wave motion Next time: More on interference, beats, diffraction Last time Frequency Spectrum – intensity as a function of frequency (shows how much energy or power there is in a specific frequency range) Spectrogram or Sonogram – intensity as function of both frequency and time Pressure = Force/Area - N/m 2 Background air pressure is 1 atm = 100,000 N/m 2 Sound pressure fluctuations are very small, say 10 -6 atm
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Outline Transverse and Longitudinal waves Wavelength Superposition (addition) of waves Reflection for string waves Spatial interference
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“If you’ve seen one wave you’ve seen them all.” – Richard Feynman Waves on a string
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the direction of wave propagation Longitudinal waves – motion of the medium is in the direction of wave propagation The wave follows a path – the direction of propagation But the “medium” – the material in which the wave propagates can go “up and down” –
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week 4a - Physics 1240 Today: Wave motion Tuesday 2/1/11...

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