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I was considering this sound problem.. For a 100-W megaphone,
how far would you have to be so that it is barely audible (0 dB)?
I = P/A
Io = P/4pir2
With Io = 10-12 W/m2, the result is 2821 km = 1750 mi
This seems unreasonably far! I would think that the sound
level would drop off much closer, as we typically experience.
Or am I missing/miscalculating something?
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