Its the different speed of sound through air at different densities
that effectively kills high frequencies through phase interference
and frequency spreading.
A sharp lightening transient will be spread by the different
speeds of sound in the various atmospheric layers, as it
spreads its frequency components wil continually lower,
giving only the rumble effect at long distances.
sreten.
that effectively kills high frequencies through phase interference
and frequency spreading.
A sharp lightening transient will be spread by the different
speeds of sound in the various atmospheric layers, as it
spreads its frequency components wil continually lower,
giving only the rumble effect at long distances.
sreten.
Sch3mat1c said:
Speaking of which, something I've always wondered is just how high a frequency can be transmitted acoustically - I know over 100kHz exists!
Unless I misremember the figures 300kHz obviously works well
http://www.diyaudio.com/forums/showthread.php?s=&threadid=6309&highlight=
Sch3mat1c said:I think he wants to know about ultrasonics. Like, are they attenuated any more than otherwise?
Not exclusively,
Ideally I would like to see frequency response graphs
10hz - 100khz
at 1 meter, 2m, 3m, 4m, 5m.
what happens to a square wave leading edge would also be interesting.
mikelm said:
what happens to a square wave leading edge would also be interesting.
Finding the transducer for this would be quite a challenge!
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