Oh, sadness!! I specifically remember doing a frequency test when I was 17 and I topped out at 19 KHz. I am neither young, nor invincible to the ravages of age.
Oh well, most of my professional peers are still older than I am, so I guess I'm still doing okay.
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Originally Posted by Rexmons
1. Can words be transmitted in this frequency so only young people can hear it?
2. Can this annoying sound be played on giant speakers and cripple bad youngsters leaving adults unharmed?
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1.) Language would require the fluctuations of frequencies, otherwise it's just starts and stops, like morse code. But it's conceivable that you could have the speech pitched up to 17.5 KHz
and higher, which would accomplish the same thing--except you'd start to hit the ceiling of what your average teenager can hear (18-19 KHz) pretty quickly. I don't know if only 1KHz of difference between the highest and lowest pitches could produce an intelligible message or not.
2.) If by crippling you mean actually hurting their ears through the volume of the sound, then no, the adults would feel the pain too. The adult eardrums would still be subject to the very real pressure waves in the air, they just wouldn't be able to interpret it as a sound. Loud enough to drive them insane without being loud enough to
hurt, though--that would be do-able.