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Homework Help: Single beats, infinitely many frequencies

  1. May 31, 2013 #1
    Does anyone know how to prove that if we want to make a single wavepacket in space we necessarily have to superpose a continuous infinity of frequencies? Any help much appreciated!
     
  2. jcsd
  3. Jun 5, 2013 #2
    A wavepacket is an integrable function, and the Fourier transform of an integrable function is continuous.
     
  4. Jun 12, 2013 #3
    Thanks a lot, that helps!
     
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