Was my junior high speech teacher correct about sound waves?

He said that when a person speaks, he emits sound waves.  Also, that the sound waves remain in existence forever.  Therefore, he said, if we could develop the proper equipment, we could go back to Gettysburg, Pennsylvania, amplify the sound waves that are in air, and hear Abraham Lincoln delivering the Gettysburg Address.

Is there any scientific basis for what he was telling us?

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  • 1 month ago
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    No. Absolutely not. Sound waves move thru the air at about 750 miles per hour. They do not stand still. And they are absorbed very quickly. 

  • 1 month ago

    No, he is totally wrong. Sound waves quickly die out, are reduced to heat and random motions of molecules. The loudest possible sound could last a few hours at the most. Ordinary sounds are absorbed in seconds.

    online:

    The Sound So Loud That It Circled the Earth Four Times: The 1883 eruption on Krakatoa may be the loudest noise the Earth has ever made.

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