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![]() ![]() Since sound waves travel at about 340 m/s at room temperature, it will take approximately 0.1 s for a sound to travel the length of a 17 meter room and back, thus causing a reverberation ( recall from Lesson 2, t = d/v = (34 m)/(340 m/s) = 0.1 s). The reception of multiple reflections off of walls and ceilings within 0.1 seconds of each other causes reverberations - the prolonging of a sound. If a reflected sound wave reaches the ear within 0.1 seconds of the initial sound, then it seems to the person that the sound is prolonged. Why the magical 17 meters? The effect of a particular sound wave upon the brain endures for more than a tiny fraction of a second the human brain keeps a sound in memory for up to 0.1 seconds. A reverberation often occurs in a small room with height, width, and length dimensions of approximately 17 meters or less. ![]() Reflection of sound waves off of surfaces can lead to one of two phenomena - an echo or a reverberation. 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