This process is called vortex shedding and is another means by which sound waves are formed. This is how a whistle or flute produces sound. Aslo the aeolian harp effect of singing power lines and fluttering venetian blinds. ... echo sounding...
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physics.info/sound/
physics.info/sound/
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Echo is something you experience all the time. If you shout into a well or a canyon, the echo comes back a moment later. The echo occurs because some of the sound waves in your shout reflect off of a surface (either the water at the bottom of the well or the canyon wall on the far side) and travel back to your ears.
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science.howstuffworks.com/radar1.htm
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Sound waves can be reflected, refracted (or bent), and absorbed as light waves can be. The reflection of sound waves can result in an echo—an important factor in the acoustics of theaters and auditoriums.
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www.infoplease.com/ce6/sci/A0861183.html
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Sound which has been reflected is called an echo. As with other waves, sound reflection best occurs from flat, hard surfaces. ... The natural echo of a room is called reverberation. This is a measure of how much the sound is reflected around the room. Materials which are soft and uneven (like curtains,
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www.gcsescience.com/pwav11.htm
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Echoes has moved ... Sorry for the inconvenience...
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www.school-for-champions.com/science/echoes.htm
www.school-for-champions.com/science/echoes.htm
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Properties of Sound Waves ... Very Strong Sound Waves ... A concise survey of the fundmental properties of sound waves...
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www.du.edu/~jcalvert/waves/soundwav.htm
www.du.edu/~jcalvert/waves/soundwav.htm
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Echoes in Rainbow Colors Craft. Create a design with a terrific outside shape. Then create an ... Create a design with a terrific outside shape. Then create an "echo" as "sound waves" fill your Color Explosion™ paper. ... "What a fun way to describe the concept of sound waves. "; Elwood K., after-school child care provider.
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www.crayola.com/crafts/detail/echoes-in-rainbow-colors-...
www.crayola.com/crafts/detail/echoes-in-rainbow-colors-craft/
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If the wall is relatively flat, perpendicular to the source of the sound, and far enough away (but not too far), then you can hear the reflected waveform or echo. If the sound comes back in about 0.1 second or longer, ... Sonar and radar work on the same principle. Sonar uses sound waves, while radar uses electromagnetic waves.
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www.school-for-champions.com/science/sound_echoes.htm
www.school-for-champions.com/science/sound_echoes.htm
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echo n. , pl. , -oes . Repetition of a sound by reflection of sound waves from a surface. The sound produced in this manner ... Sonar and depth sounders work by analyzing electronically the echo time lag of sound waves, generally between 10 and 50 kilohertz, produced by underwater transducers.
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www.answers.com/topic/echo-1
www.answers.com/topic/echo-1
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