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Question:

An EM wave has frequency $7.14 \times 10^{14} \textrm{ Hz}$. What is its wavelength, and how would we classify it?

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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$420 \textrm{ nm. This is visible violet light}$