Bobbywhy

Diffraction of sound: the bending of waves around small* obstacles and the spreading out of waves beyond small* openings.
http://hyperphysics.phy-astr.gsu.edu...d/diffrac.html

Also see the images: https://www.google.com/search?q=soun...w=1350&bih=647

Cheers,
Bobbywhy