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www.livephysics.com/physical-constants/optics-pc/wavelength-colors

But light waves can also have wavelengths lower or higher than the wavelengths in the visible spectrum, and many familiar types of radiation are just light waves with other wavelengths. Ultraviolet light and x-rays have wavelengths shorter than violet light, and infrared (heat) and radio waves have wavelengths longer than red light.

www.sciencelearn.org.nz/resources/47-colours-of-light

Objects appear different colours because they absorb some colours (wavelengths) and reflected or transmit other colours. The colours we see are the wavelengths that are reflected or transmitted. For example, a red shirt looks red because the dye molecules in the fabric have absorbed the wavelengths of light from the violet/blue end of the spectrum.

en.wikipedia.org/wiki/Color

Electromagnetic radiation is characterized by its wavelength (or frequency) and its intensity.When the wavelength is within the visible spectrum (the range of wavelengths humans can perceive, approximately from 390 nm to 700 nm), it is known as "visible light". Most light sources emit light at many different wavelengths; a source's spectrum is a distribution giving its intensity at e...

en.wikipedia.org/wiki/Visible_spectrum

The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light.A typical human eye will respond to wavelengths from about 380 to 740 nanometers. In terms of frequency, this corresponds to a band in the vicinity of 430–770 THz.

www.reference.com/science/wavelengths-colors-rainbow-ce1138a94638ea47

The wavelengths of the colors of the rainbow range from 390 nanometers to 780 nanometers. There are wavelengths that are lower or higher than those in the visible spectrum, and several types of radiation are simply light waves with other wavelengths.

hyperphysics.phy-astr.gsu.edu/hbase/vision/specol.html

Color. It is common practice to define pure colors in terms of the wavelengths of light as shown. This works well for spectral colors but it is found that many different combinations of light wavelengths can produce the same perception of color.

sciencestruck.com/color-spectrum-chart

The frequency of wavelength range for indigo is around 425-450 nm and frequency of 670-700 THz. In the above color spectrum chart, indigo is made a subset of violet color. The low range of the color explains why it is difficult to distinguish this color in the spectral band.

www.thoughtco.com/understand-the-visible-spectrum-608329

The visible spectrum does not encompass all the colors humans perceive because the brain also perceives unsaturated colors (e.g., pink is an unsaturated form of red) and colors that are a mixture of wavelengths (e.g., magenta). Mixing colors on a palette produces tints and hues not seen as spectral colors.

www.answers.com/Q/Light_of_different_wavelengths_is_different_colors

Different colors of light are different wavelengths of the electromagnetic spectrum. White light can be seen as all colors combined (the exact opposite of the pigment spectrum where it is the lack ...

science.nasa.gov/ems/09_visiblelight

As the full spectrum of visible light travels through a prism, the wavelengths separate into the colors of the rainbow because each color is a different wavelength. Violet has the shortest wavelength, at around 380 nanometers, and red has the longest wavelength, at around 700 nanometers.