Green light has a lower frequency than blue light. Which color of light has a longer wavelength?

1 Answer
David G.
May 1, 2016

The equation for electromagnetic radiation is #c=flambda# where #c# is the (constant) speed of light in a vacuum #(ms^-1)#, #f# is the frequency #(Hz=s^-1)# and #lambda# is the wavelength #(m)#. Since #c# is constant, if #f# gets smaller, #lambda# must get larger, so green light has the longer wavelength.

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