Face to face
like I'm imagining
Baby how can I be sure
that you're the one I'm waiting for
Will you be unmistakable
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n 1801, the German physicist Johann Wilhelm Ritter, found that there exist invisible rays beyond the violet end of the visible spectrum of the Sun that darken silver chloride even more efficiently than visible light. This spectra region between visible light and X-rays was found to be more chemically active than visible light, and named as the ultraviolet region.
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
.
The name means "beyond violet" (from Latin ultra, "beyond"), violet being the colour of the shortest wavelengths of visible light. UV light has a shorter wavelength than that of violet light
The electromagnetic spectrum of ultraviolet light can be subdivided in a number of ways. The draft ISO standard on determining solar radiances (ISO-DIS-21348)[3] describes the following ranges:
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 |