Physics Question: What is the corresponding wavelength of this photon?

Question

Atomic transitions of electrons between different states in an atom can produce photos with frequencies of 3 * 10^16 Hz.  What is the corresponding wavelength of this photon? Give your answer in nanometers

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Answer 1

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It doesn't matter how the photons are produced. Just take the distance that light travels in 1 second, and divide it into 3 * 10^16 equal parts. Each of those part is one wavelength.

Answer 2

3*10^16 hz=4*10^-7m=40 nM  uV light.