week 4b - Physics 1240 Today Interference Beats Diffraction...

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Physics 1240 Thurs 2/3/11 Today: Interference, Beats, Diffraction Next time: Sound Intensity Last time frequency = speed / wavelength: f = v / λ Transverse wave – motion of the medium is perpendicular to the direction of wave propagation Longitudinal waves – motion of the medium is in the direction of wave propagation Superposition – Waves just add Reflection
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Outline Spatial Interference Beats or Temporal Interference Diffraction
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Simulations http://www.falstad.com/ripple/ http://phet.colorado.edu/en/simulation/wave- interference Also, search for videos of real ripple tanks
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CQ 4.5 A piano string is tuned to a a frequency of 688 Hz. What is the wavelength of a wave that propagates along this piano string? A) 2.0 m B) 1.0 m C) 0.5 m D) Insufficient information to determine
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Spatial Interference
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What might cause more and closer together spatial regions of minima and maxima from a two-source interference experiment? A) Lower frequency
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week 4b - Physics 1240 Today Interference Beats Diffraction...

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