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Re: Underwater latency (not completely OT) ;-)

>> ...Since lower frequencies typically contain/require more energy in 
>> the first place, they have a tendency to stay more coherent over a 
>> longer distance.  That's one reason why the Navy can use ELF 
>> (extremely long frequency) waves to communicate with submarines over 
>> distances of many, many miles.

On Mar 16, 2005, at 4:43, Matthias Grob wrote:
> and why create those huge whales such a high pitch sound to call?

Yeah, that's an interesting question that has been in my mind since I 
was a kid and heard dolphins for the first time. Maybe they use this 
for "short distance calls"? When I was scuba diving in the Red Sea a 
"fish expert" told me that sharks (as most fish BTW) can "hear" with 
their body. Along the left and right side lines they have receptors 
that can measure water waves (known to us as "sound"). Especially 
sharks are very talented in hearing those low frequencies that are 
created by a fish fighting or splashing by the water surface (don't 
swim like a damaged fish, if you don't want to call for sharks;-)

Maybe all fishes "hear" also much lower frequencies (like 1 - 2 Hz?) 
with their body lines. I guess the sea should be a pretty noisy place 
for a fish, if that's true, so maybe some sea animals keep their 
communication in that higher pitch only to stay free from that terrible 
noise floor?

Greetings from Sweden

Per Boysen
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