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If you were writing the wavelength as 5.51 then it would be 5.51x10^-7 m. Professor Lavelle wrote the wavelength as 551 with no decimal, so it would be 551x10^-9 m. I think that because we are using scientific notation the correct answer would be 5.51x10^-7 m. But 5.51x10^-7 m and 551x10^-9 m are technically the same value!
Nm is equal to 10^-9 m. The question will specify whether to use m, nm, or whatever unit as an answer. He did start off with 5.51 x 10^-7 m, but in order to make it a nm you have to move the decimal two places to the right since you are making the -7 into a -9. Hope this helps.
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