Register to reply

Seeing through walls

by aquabum619
Tags: walls
Share this thread:
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?
Phys.Org News Partner Science news on Phys.org
Scientists develop 'electronic nose' for rapid detection of C. diff infection
Why plants in the office make us more productive
Tesla Motors dealing as states play factory poker
cristo
#2
Apr17-07, 01:23 PM
Mentor
cristo's Avatar
P: 8,317
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: 2,046
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: 1,350
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
Sci Advisor
HW Helper
Thanks
P: 25,228
Happy 700, doc! Rockets, huh?
denverdoc
#7
Apr17-07, 10:49 PM
P: 1,350
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.


Register to reply

Related Discussions
Falling through walls General Physics 6
How come we can't walk through walls? Introductory Physics Homework 46
Walking through walls Advanced Physics Homework 5
Walking through walls? General Physics 7
Ideal Gas vs. Van Der Walls General Physics 2