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en.wikipedia.org/wiki/Echo

In audio signal processing and acoustics, Echo is a reflection of sound that arrives at the ... Acoustic waves akola are reflected by walls or other hard surfaces, such as mountains and privacy fences. The reason of reflection may be explained as ...

www.physicsclassroom.com/mmedia/waves/er.cfm

If you have ever been inside of a large canyon, you have likely observed an echo resulting from the reflection of sound waves off the canyon walls. Suppose you ...

www.dkfindout.com/us/science/sound/echoes

An echo is a sound that is repeated because the sound waves are reflected back. Sound waves can bounce off smooth, hard objects in the same way as a ...

www.ask.com/youtube?q=Sound+Waves+Echo&v=uB3qFfKwwDQ
Nov 27, 2015 ... Useful for CBSE, ICSE, NCERT & International Students Grade : 9 Subject : Physics Lesson : Wave motion and sound Topic: Echoes An echo is ...

physics.tutorvista.com/waves/sound-reflection.html

So, now we discuss the process of sound waves, its reflection, echo sound, and reason for reverberation. It is behaving as wave which produce by vibration in an  ...

www.gcsescience.com/pwav11.htm

Echo and Reverberation - Reflected Sound Waves.

www.echocardiographer.org/Echo%20Physics/Sound%20waves.html

Sound waves are longitudinal mechanical waves. Longitudinal means that the direction of the vibrations are in the same direction as that of the propagation ...

www.bbc.co.uk/education/guides/z8d2mp3/revision

Sound waves are longitudinal waves that must pass through a medium, such as air. Echoes are reflections of sounds. The frequency of ultrasound is above 20 ...

www.bbc.co.uk/education/guides/z8d2mp3/revision/3

Sound waves are longitudinal waves that must pass through a medium, such as air. Echoes are reflections of sounds. The frequency of ultrasound is above 20 ...