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The relationship between energy and wavelength is determined by the Planck-Einstein relation E = h f = h c λ {\displaystyle E=hf={\frac {hc}{\lambda }}} where E is the energy of the quantum ( photon ), f is the frequency of the light wave, h is the Planck constant , λ is the wavelength and c is the speed of light .
[53] [56] [57] In optics, violet is a spectral color; it refers to the color of any different single wavelength of light on the short wavelength end of the visible spectrum, between approximately 380 and 450 nanometers, [58] whereas purple is the color of various combinations of red, blue, and violet light, [50] [55] some of which humans ...
The rated wavelength is the peak wavelength that the LEDs put out, but light at both higher and lower wavelengths are present. [citation needed] The cheaper and more common 395 nm UV LEDs are much closer to the visible spectrum, and give off a purple color. Other UV LEDs deeper into the spectrum do not emit as much visible light. [41]
Violet is closely associated with purple. In optics, violet is a spectral color: It refers to the color of any different single wavelength of light on the short wavelength end of the visible spectrum (between approximately 380 and 435 nanometers), [16] [17] whereas purple is the color of various combinations of red, blue and violet light, [5 ...
The spectral colors from red to violet are divided by the notes of the musical scale, starting at D. The circle completes a full octave, from D to D. Newton's circle places red, at one end of the spectrum, next to violet, at the other. This reflects the fact that non-spectral purple colors are observed when red and violet light are mixed.
The center wavelength for most actinic light products is 420 nanometers, with longer wavelengths regarded as "royal blue" (450nm) to sky blue (470nm) and cyan (490nm) and shorter wavelengths regarded as "violet" (400nm) and blacklight (365nm). Actinic light centered at 420nm may appear to the naked eye as a color between deep blue and violet.
Purple and blue are related to nitrogen, with purple lights appearing higher than 60 miles above the ground while blue hues glow below this threshold. Green, red and purple aurora over Mefjord in ...
When pointed at many white objects (such as white paper or white clothes which have been washed in certain washing powders) the visual appearance of the laser dot changes from violet to blue, due to fluorescence of brightening dyes. For display applications which must appear "true blue", a wavelength of 445–450 nm is required.