What is the frequency of a blue light with a wave length of 469 nanometers?

What is the frequency of a blue light with a wave length of 469 nanometers?
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Frequency is in cycles per unit timeWavelength is in length per cycleTo convert between the two you need the speed of the wave -which for light is the speed of light - which is given in lengthper unit timeFrequency = Speed of light/WavelengthFor a wavelength of 469 nanometersFrequency is 639 Terahertz (THz) or 639,000 Gigahertz (GHz) ...rounded to 3 significant digits since the wavelength is only givento 3 significant digits
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