by 
Suriya
ANSWERS: 4
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I I I I I can't can't can't can't say say say say say say
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Recording studio. highly insulated walls.
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Because the hollowness does not show in small rooms. Hollowness in big halls do work wonders. Lovingly Maggge. Have you ever called out “Hello” only to have your own voice answer you back a moment later with your very same “Hello”?? An echo can be very mysterious and strange – what causes it to happen? If you've ever touched the top of a stereo speaker and felt it vibrating, then you've already felt the way sound moves and travels. Sound is actually created when little units of air move around, and together the little units of moving air are called "sound waves." An echo is what happens when sound bounces off a surface as it moves – by bouncing back, the sound plays itself again! (Sometimes more than once!) The time between when the sound is emitted and when it echoes back depends on how far it travels before bouncing back. An echo is more likely to happen when the sound has a lot of surfaces to bounce off of, which is why caves and alleyways are usually so full of echoes! (…full of echoes…full of echoes…full of echoes!) Lovingly Maggge.
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Actually, there is an echo in a small room just as there is an echo in a large room. An echo is what you hear when a sound that comes from you, or near you, hits a distant object and reflects back. In a small room, the distance is very short and the reflected sound reaches you so quickly that you are not aware of it. However, if you were in a small room where all the sound was intentionally deadened. You would notice the difference.
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