Natural Science Forum / Physics / Acoustics / February 2004

Is is possible for sound waves in the visible light frequency to exist?
Electromagnetic waves in the audible 20 Hz to 20 KHz would be the reverse.

how can I reflect an acoustic shock wave ?
I'm searching all the ways in can do this ?
Malte

Hear Me! You all need to hear me.
Your force or all the other forces around me are certainly stronger
mine. Is this the only point all of you want to make to me? Or
something else?

Well, I got a question today from a client having a problem with
seaguls: would it be possible to hold the seaguls away by means of
sound "uncomfortable" to birds but non-perceivable by humans?
I don't know if seaguls are sensitiv to ultrasound. Does anybody know?

I have recently noticed that several sites on the internet are using F.
Alton Everest's equation cited in "The Master Handbook of Acoustics" and
"Handbook for Sound Engineers" to calculate the resonance frequency for a
tuned slat absorber (Helmholtz resonator).  This equation is ...

Testing something. Ty

Folks,
We have a potential new railway line, following a defunct alignment,
passing close to property and in the proximity of old mine workings.
Local residents have questioned the potential for vibration from the

I am looking for a very simple sound level indicator that shows when
the sound level is more than 50, 55 and 60 dB(A)( +/- 3 dB(A)).
Hardware or software (with datamic + sound card).
/Gunnar

I have a Dan Gibson parabolic microphone that I use for recording nature sounds
It works great except for road noise from distant passing cars, even with the
dish pointed away from the road noise. My thoughts are that the sounds are
hitting the back of the plastic 18" dish, I would ...