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What is the relationship between the colors red, green, and violet in terms of the frequency of light waves?

Red has a lower frequency (longer wavelength) than green, which has a lower frequency than violet.

Light we see as red has a frequency range of about 400 to 484 THz and a wavelength of about 620 to 750 nm.

For orange, the frequency range is about 484 to 508 THz and the wavelength range is about 590 to 620 nm.

For yellow, frequency is about 508 to 526 THz, wavelength is about 570 to 590 nm.

For green, frequency is about 526 to 606 THz, wavelength is about 495-570 nm.

For blue, frequency is about 606 to 668 THz, wavelength is about 450 to 495 nm.

Finally, for violet, frequency is about 668-789 THz, wavelength is about 380 to 450 nm.

All of these are approximate, and actually different people will vary as to the precise color they see for any given frequency. We are most sensitive to light in the range around green, and least sensitive around red and violet; frequencies lower than red are invisible infrared, and frequencies higher than violet are invisible (and hazardous) ultraviolet.

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