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An echo is a distinct repetition of the original sound. The reflection of sound from a cliff face for example. A flutter echo is s separate class of echoes (according to the acousticians), and will be experienced in a relatively bare room, where an impulse sound such as a clap will be heard multiple times, but quickly decreasing in volume. Your bathroom might be a good place to try for one.
In a concert hall (or a lecture room), an early reflection of the sound will not be perceived as a separate signal, but will aid in better understanding of the source, and may in fact be the source of the majority of the signal at that point. The source of the sound will still be seen as that from which the signal was first heard. Our ears have some truly remarkable properties.
Reverberation is the sustained repetition of echoes of the original sound. A small amount of reverberation is a desired feature in a concert hall, as it adds warmth to the sound. But excessive reverberation; as in many cathedrals for example; seriously interferes with the understanding of speech. It suits organ music very well.
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Wave that moves back and forth?
True. The up-down type of wave is called a "transverse wave". Light, for example, is this kind of wave. Sound, however, is a different kind of wave. It is the back-forth type, called "longitudinal", or "compression" waves.
Why is it not possible to use sonar to determine the speed of an object travelling faster than the speed of sound?
Sonar uses sound waves to measure distances by calculating the time it takes for the sound waves to bounce back. However, when an object is traveling faster than the speed of sound, the sound waves emitted by the sonar system cannot catch up with the object to bounce back, making it impossible to accurately determine the speed of the object using sonar.
Why do voices echo?
Voices echo when sound waves hit a hard surface and are reflected back with minimal absorption. This creates multiple sound waves bouncing back and forth between surfaces, resulting in the perception of echo.
When you make sounds by plucking a rubber band you make the rubber band move back and forth very quickly this movement is called?
Vibration. The back and forth motion of the rubber band creates sound waves that we perceive as sound.
Sonar machines rely on which property of sound waves?
Sonar machines rely on the property of sound waves that allows them to bounce off objects and return to the source, a phenomenon known as echo. By calculating the time it takes for the sound wave to bounce back, sonar machines can determine the distance and location of objects underwater.
