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proper unit for frequency is Hertz (Hz) which is cycles per second (s^-1) and for wavelength it's usually m (or nm) but it depends on the question because it can ask for the wavelength in a particular unit.
I have seen questions that asked for both frequency and wavelengths, or just one. If you have one but not the other, it is easy enough to convert between frequency and wavelength using v = c/lambda, so it doesn't really matter which order you find them.
On a related note, when we are showing the answer for a wavelength, should it always be in meters? For some questions in the solution manual, the final answer is written in nanometers. Does it matter which one we use for the final answer?
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