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# Re: [TCML] Resonating in the visible light frequency spectrum

```Interestingly, I think, and more generally, the resonant frequency of
light is 1 / sqrt(u*m), where u = electric permeability, and m =
magnetic permeability of free space.

Doesn't that equation look familiar?

On 2/1/2017 10:02 PM, Ed wrote:
> Don't trust Cheney very much.  She's started a lot of myths.  For a
> really well researched and reliable book on Tesla look at 'Wizard':
>
> https://www.amazon.com/Wizard-Times-Nikola-Biography-Genius/dp/0806539968/ref=sr_1_1?s=books&ie=UTF8&qid=1486004460&sr=1-1&keywords=genius+seifer
>
>
> Lots more in there than Cheney and all of it trustworthy.
>
> Ed
>
>
> On 2/1/2017 10:10 AM, Brian Hall wrote:
>> One of Nikola Tesla's late night "party trick" demonstrations, in the
>> era where people such as  Mark Twain would come to his New York City
>> lab,  was to light up the room bright as day with no obvious source.
>> (Tesla: Man out of Time by Margaret Cheney)
>>
>> (If I made an error in these estimations please let me know.)
>> I am curious if generating such light was by means of creating an
>> oscillator that resonated in the visible light spectrum.  Given
>> visible light between 470 and 650 nm, let's pick 500 nm. The frequency
>> would be f=c/wavelength = (300x10^6 meters per second)/(500x10^-9
>> meters)= 0.6x10^-15 = 600x10^12 Hz, or 600 THz.
>> That's an insanely high frequency!  Consider 2.4 GHz from your kitchen
>> microwave or WiFi, 1 terahertz is of course 1000x greater than 1
>> gigahertz...
>>
>> With L and C components at that frequency, even with a 1 pF capacitor,
>> L = 1/((6.28^2)*((600x10^12)^2)*1x10^-12) = 70.4x10^-21 or 70.4
>> zeptohenries of inductance! That's three jumps smaller than pico on
>> the SI scale   https://ned.ipac.caltech.edu/level5/Units/frames.html
>>
>> Either way, the inductance or capacitance would have to be incredibly
>> tiny.  How would one create an oscillator that could run at 600 or so
>> THz, with either modern technology, or just what was available in
>> Tesla's day?  I recall reading there are some airport security scanner
>> technologies operating in the low THz in development, but don't recall
>> those articles getting into detail about the components or design of
>> such an oscillator.
>>
>>
>> ----------------------------------
>> Brian Hall
>>
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>>
>
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