Approximate wavelength and frequency ranges for the various colors:
Color: Wavelength (nm) / Frequency (THz)
Red: 625-740 nm / 480-405 THz
Orange: 590-625 nm / 510-480 THz
Yellow: 565-590 nm / 530-510 THz
Green: 520-565 nm / 580-530 THz
Blue: 450-500 nm / 670-600 THz
Violet: 380-430 nm / 790-700 THz
1 nm = 10-3 um = 10-6 mm = 10-9 m
1 terahertz (THz) = 103 GHz = 106 MHz = 1012 Hz
White light is a mixture of the colors of the visible spectra.