Seeing through walls

  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. cristo

    cristo 8,407
    Staff Emeritus
    Science Advisor

    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. Then why is that the wall obstructs the sound?
     
  5. 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. 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. Dick

    Dick 25,822
    Science Advisor
    Homework Helper

    Happy 700, doc! Rockets, huh?
     
  8. 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. It depends on the wavelenght, alonger wave like sounds "go over" lager objects.
     
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