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Seeing through walls

by aquabum619
Tags: walls
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aquabum619
#1
Apr17-07, 01:17 PM
P: 29
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?
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cristo
#2
Apr17-07, 01:23 PM
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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?
neutrino
#3
Apr17-07, 01:23 PM
P: 2,047
Then why is that the wall obstructs the sound?

aquabum619
#4
Apr17-07, 01:25 PM
P: 29
Seeing through walls

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?
denverdoc
#5
Apr17-07, 09:47 PM
P: 1,351
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.
Dick
#6
Apr17-07, 10:36 PM
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Thanks
P: 25,246
Happy 700, doc! Rockets, huh?
denverdoc
#7
Apr17-07, 10:49 PM
P: 1,351
I never even noticed, but thanx, and no new ground here, humanity has a choice between well what we are doing and hedging bets,
MattiasL
#8
Apr27-07, 04:26 PM
P: 1
It depends on the wavelenght, alonger wave like sounds "go over" lager objects.


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