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Difraction and stationary wave

  1. Nov 25, 2004 #1
    a)Sodium light produces two types of wavelength 589.0nm and 589.6nm.the two emissions have similar intensities.explain if you'd expect the presence of two wavelengths to be a problem in obserbing a clear interference pattern

    b)A loud speaker is hung on the top of a clamp facing vertically downwards on a bench.The loudspeaker is turned on and the stationary wave pattern is formed.Explain why the contrast between maxima and minima becomes less pronounced as the microphone is raised further from the surface of the bench.

    If you can giveme some hint i'd be very grateful.
  2. jcsd
  3. Nov 25, 2004 #2
    I'd guess the sodium emissions would overlap eachother looking as it was one?
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