On 1/9/07 2:20 AM, in article
,
" wrote:

Reflection of light and sound

" Sound waves are reflected or bounced from hard surfaces.
" An echo is a reflection of sound........
Detail of article is at.......
http://www.studyandjobs.com/reflecti...and-sound.html

or for Physics learners, freshers who wants to see some easy
understandable notes...

http://www.studyandjobs.com/physics.html
regards

Sound will also bounce off of "soft" surfaces. For example, sound going from
air to helium will reflect. From carbon dioxide to hydrogen would reflect
even more.

Bill
-- Fermez le Bush