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Homework Help: Seeing through walls

  1. Apr 17, 2007 #1
    1. The problem statement, all variables and given/known data

    how come we can hear around corners but we cant see around corners?

    2. Relevant equations

    3. The attempt at a solution
    because the wall is obstructing the image?
  2. jcsd
  3. Apr 17, 2007 #2


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    It's to do with diffraction of the wave around the object. What do you know about diffraction? What factors do diffraction depend upon?
  4. Apr 17, 2007 #3
    Then why is that the wall obstructs the sound?
  5. Apr 17, 2007 #4
    Diffraction by definition is the divergence of light from its initial line of travel.
    But images cant diffract through walls, right? Diffraction depends on coherent sources of light waves from a monochromatic source. wrt the double slit ex. right?
  6. Apr 17, 2007 #5
    Much more general than that. If the wavelength is anywhere close to the obstaces dimensions it will move around it, while small wavelengths are a bb on a brickwall, long wavelengths more like a a blob of jello which will peek around corners.
  7. Apr 17, 2007 #6


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    Happy 700, doc! Rockets, huh?
  8. Apr 17, 2007 #7
    I never even noticed, but thanx, and no new ground here, humanity has a choice between well what we are doing and hedging bets,
  9. Apr 27, 2007 #8
    It depends on the wavelenght, alonger wave like sounds "go over" lager objects.
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