[Stk] Does very low/high frequency damage your ear?

[Craig Sapp]

But apparently people can 'hear' microwaves:
    https://en.wikipedia.org/wiki/Microwave_auditory_effect

<<The microwave auditory effect, also known as the microwave hearing effect
or the Frey effect, consists of audible clicks (or, with speech modulation,
spoken words) induced by pulsed/modulated microwave frequencies. The clicks
are generated directly inside the human head without the need of any
receiving electronic device. The effect was first reported by persons
working in the vicinity of radar transponders during World War II. These
induced sounds are not audible to other people nearby. The microwave
auditory effect was later discovered to be inducible with
shorter-wavelength portions of the electromagnetic spectrum. >>

Protect yourself:
     https://en.wikipedia.org/wiki/Tin_foil_hat




On 31 October 2015 at 18:21, Perry Cook <prc at cs.princeton.edu> wrote:

> Radio is electromagnetic waves, traveling, as alternating electric and
> magnetic waves.  Sound is air compressions traveling through the air.
>
> Sent from my iPhone
>
> On Oct 31, 2015, at 10:17 AM, Michael Feldman <michaelfeldman at ymail.com>
> wrote:
>
> Aren't you just talking about what radio waves are.
>
> Ultra high frequencies that we need radio to convert to our frequencies.
> At least that's what I thought; please confirm?
>
> Btw, levitation might be the next breakthrough technology humans conquer.
> This was in the news few days ago:
>
> http://www.techtimes.com/articles/101230/20151029/u-k-scientists-use-sound-levitate-objects.htm
>
> --Michael
>
>
>
> On Oct 30, 2015, at 22:02, Craig Sapp <craigsapp at gmail.com> wrote:
>
> Hi Spencer,
>
> Basically no: if you cannot hear it, then it cannot damage your (inner)
> ear—as long as the sound is less that about 120 dB_spl.   Extremely loud
> sounds can still damage whether you can hear them or not, such as burst
> your ear drum, and if the sound is intense enough in the low frequencies it
> could probably turn you into mush.
>       https://en.wikipedia.org/wiki/Infrasound#Human_reactions
>       https://en.wikipedia.org/wiki/Ultrasound#Safety
>
> 2,000,000 GHz is pretty high—most audio speakers will only go up to 20,000
> Hz (20 kHz).  If you try to produce 2,000,000 GHz or similar with STK you
> will be wrapping around the Nyquist frequency (22 kHz maximum for CD
> sampling rate) in any case.
>
> 140-150 dB ultrasonics were in the news recently:
>     http://www.livescience.com/52598-sonic-tractor-beam-moves-objects.html
>
>
> -=+Craig
>
>
>
> On 30 October 2015 at 18:01, Propular Vid <spencerkim1214 at gmail.com>
> wrote:
>
>> Hello All!
>>
>>
>> I was just kind of wondering if frequencies that human cannot hear
>> damages your ear.
>>
>> It is known that loud sounds can damage your ear, but will it damage your
>> ear even if the sound is unhearable?
>>
>> Let's say that there is a speaker which produces 2,000,000 GHz
>> frequencies which human cannot hear and its amplitude is very high. If
>> someone is standing there, will it damage his/her ear?
>>
>>
>> Or does it only work if the sound is in human frequency range?
>>
>>
>> Regards,
>> Spencer.
>>
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