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Originally Posted by Catwoman
what I don't get is how movement translates into sound? is sound a movement? are sound waves tangible?
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Yes, and yes. You hear sound when the tight skin across your eardrum vibrates in response to the movement (vibrations) of air entering your ear.
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how do sqiggly lines on vinyl make the receiver play an EXACT replica? they'd have to be incredibly precise.
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They are analog, rather than digital, so they are like "tracing" a sound. When a record is recorded, the sound entering the recorder causes the blade to vibrate in a certain pattern on the prototype disc. When the disc is played, the needle traces that pattern and vibrates the speaker in the same way the original microphone vibrated during recording, which duplicates the sound. (This is how grammophones worked. More modern record players have levels of indirection involving electric current, but the principle is the same.)