what-is-a-standing-wave-how-is-an-echo-formed

Standing wave is phenomenon caused by waves interference. A bunch of waves summed together results on a wave that appears to be static.

Echo is the wave reflected due to obstacles on their way. For sound we are only able to notice a echo when the reflected wave takes more than 0.7s to come back, otherwise (t <= 0.7s) we call this effect as reverberation.

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