Due to Florida's proximity to the equator, the state receives more than a hundred times the UV exposure that Maine does. (source unknown)

The ultraviolet rays reflected from the snow are almost all that are present in sunlight. Nature Magazine, pg 144, 3/30/1911

Ultraviolet frequencies produce vitamin D. Birren, Faber; "Color Psychology and Color Therapy"; New York, University Books, 1961

Ultraviolet Light
According to multiple sources (NASA, FDA, and others) here are the wavelengths of the UVA, UVB and UVC regions:

Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than x-rays, in the range 10 nm to 400 nm, and energies from 3 eV to 124 eV. It is so named because the spectrum consists of electromagnetic waves with frequencies higher than those that humans identify as the color violet.

UV light is found in sunlight and is emitted by electric arcs and specialized lights such as black lights. As an ionizing radiation it can cause chemical reactions, and causes many substances to glow or fluoresce. Most people are aware of the effects of UV through the painful condition of sunburn, but the UV spectrum has many other effects, both beneficial and damaging, on human health.

Name Abbreviation Wavelength range in nanometers Energy per photon
Ultraviolet A, long wave, or black light UVA 400 nm 320 nm 3.10 3.94 eV
Near NUV 400 nm 300 nm 3.10 4.13 eV
Ultraviolet B or medium wave UVB 320 nm 280 nm 3.94 4.43 eV
Middle MUV 300 nm 200 nm 4.13 6.20 eV
Ultraviolet C, short wave, or germicidal UVC 280 nm 100 nm 4.43 12.4 eV
Far FUV 200 nm 122 nm 6.20 10.2 eV
Vacuum VUV 200 nm 10 nm 6.20 124 eV
Extreme EUV 121 nm 10 nm 10.2 124 eV

Note: nm means nanometer (400 nm = 400 x 10-9 meters or 0.0000004 meters) (source unknown)

On colours developing by the same laws as musical harmonies
—The physical properties of light and darkness briefly considered
—If the laws are correctly gained, harmonics of tones and of colours will agree
—Quotation from a lecture by Professor W. F. Barrett on the order of sonorous and luminous wave-lengths
—Fountain of musical harmonics, E root of B; in colours yellow and ultra-violet, being tints and shades of white and black
—All harmonics of sound and colour condense into a primo springing from the fountain
Multequivalency of tones and colours
Wünsch's views nearly one hundred years ago
Clerk Maxwell's, Lord Rayleigh's, and [Harmonies of Tones and Colours, Table of Contents1 - Harmonies]

This quotation on vibrations will be seen to agree with the laws which I have gained. The fact that six of the notes of keyed instruments are obliged to act two parts, must prevent the intermediate notes bearing a definite ratio of vibrations with the intermediate colours of the spectrum. I name the note A as violet, and B ultra-violet, as it seemed to me clearer not to mention the seventh as a colour. [Harmonies of Tones and Colours, On Colours as Developed by the same Laws as Musical Harmonies2, page 19]

The fountain or life of musical harmonies and colours is E, or yellow; the root B, or ultra-violet: these being, in fact, tints and shades of white and black. Ascending, they partake more of white; descending, of black: the former drawing tones and colours higher, the latter lower. [Harmonies of Tones and Colours, On Colours as Developed by the same Laws as Musical Harmonies2, page 19]

C rises from the fountain, and contains all tones within itself. Red also rises from the fountain, and contains all colours, with white and black.
D=the notes C and E mingled. Orange, red and yellow mingled.
E=the root of the fountain. Yellow, containing all colours, is white in its extreme.
F=the notes E and G mingled. Green=yellow and blue mingled.
G contains all tones. Blue, with more or less of black and white.
A=G and B mingled. Violet=blue, and all colours, inclining to black.
B, the key-note of the fountain. Ultra-violet=violet mingled with more black: a deeper shade of all colours—in its extreme, black. Orange, red and yellow mingled.
[Harmonies of Tones and Colours, On Colours as Developed by the same Laws as Musical Harmonies3, page 20]

The tones between the seven white notes of keyed instruments, and the tints and shades between the seven colours, cause the multequivalency of colours and of tones; consequently every colour, as every musical harmony, has the capability of ascending or descending, to and fro in circles, or advancing and retiring in musical clef. It is a curious coincidence that Wünsch, nearly one hundred years ago, believed in his discovery of the primary colours to be red, green, and violet; and in this scheme, red, answering to the note C, must necessarily be the first visible colour, followed by green and violet, but these not as primary colours, all colours in turn becoming primaries and secondaries in the development of the various harmonies. To gain facts by experiment, the colours must be exactly according to natural proportions—certain proportions producing white, and others black. In this scheme, green and red are shown to be a complementary pair, and therefore (as Clerk Maxwell has proved) red and green in right proportions would produce yellow. The same fact has been proved in Lord Rayleigh's experiments with the spectroscope. Yellow and ultra-violet, [Harmonies of Tones and Colours, On Colours as Developed by the same Laws as Musical Harmonies3, page 20]

Cayce (Q) Should I take ultra-violet ray baths? (A) "When there are periods where the weather provides little or no ultra-violet rays by daylight or strong sunlight, then these are always helpful." [(Cayce)) 1158-11]

See Also

B flat

Created by admin. Last Modification: Sunday June 13, 2021 07:42:32 MDT by Dale Pond.