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Q: What one word describe the movement of source of sound?
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What word is used to describe a reflected sound?

Echo


What word is used to describe the movement of heat through solid objects?

Conduction


What is the quietest sound in the world?

Nothing. No movement. Don't think of the word "nothing" as literally being nothing. It is something. Nothing IS being or doing something.


What happen to the loudness of sound as the distance incrase between a person and the source of the sounds?

Don't use the word loudness, because that is a psychoacoustic personal feeling. Look for sound pressure.The sound pressure decreases with distance r in a free field (direct field).The next question is. How does the sound decrease with increasing distance? After which law?The sound pressure p diminishes with distance after the 1/r law. Sound pressure decreases inversely as the distance increases with 1/r from the sound source. The Sound pressure level (SPL) decreases by (−)6 dB per doubling of distance from the source to 1/2 (50 %) of the sound pressure initial value.Equations: p2 / p1 = r1 / r2 and p2 = p1 x r1 / r2 or r2 = r1 x p1 / p2p1 = sound pressure 1 at reference distance r1 from the sound source.p2 = sound pressure 2 at another distance r2 from the sound source.Scroll down to related links and look at "How does the sound or the noise decrease with distance?"


How are vibrating objects and sounds related?

The vibration is probably caused by sound. To explain first understand that sound is a wave of vibration that the human ear decodes into something,whether its a word or just a sound like for instance a book hitting the floor. When the vibration reaches the object it can cause it to vibrate.