3. Ανάκλαση του ήχου

http://static.howstuffworks.com/flash/bat-echo.swf

http://www.dolphinkind.com/images/echolocation.swf

https://www.nde-ed.org/.../Sound/Graphics/Flash/multiroom.swf

http://eclass31.pbworks.com/w/file/fetch/56569434/echo.swf