Question: 4. A photon is absorbed by an electron in the n = 2 level of hydrogen promoting it to the n= 4 level. What was

4. A photon is absorbed by an electron in the n
= 2 level of hydrogen promoting it to the n= 4 level.

4. A photon is absorbed by an electron in the n = 2 level of hydrogen promoting it to the n= 4 level. What was the frequency of the photon

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