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What is the general rule when it comes to energy of sound?

Updated: 8/20/2019
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11y ago

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Perhaps the most general rule as regards the energy of sound is that it is mechanical energy, and for it to propagate, the energy must be transferred into the medium through which it is traveling. Speakers creating sound for entertainment transfer sound energy into the air, and it moves to a listener. A sonar (sound) signal is transferred into water to move out, impinge on objects in the water, and then return (the echo) to a transducer in a system to locate or image underwater objects. Compare this to outer space, which is a vacuum. Sound energy cannot travel there as there is no medium into which the energy can be transferred.
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Q: What is the general rule when it comes to energy of sound?
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