Energy of a photon
What is the energy of a photon emitted from an electron in a hydrogen atom when it jumps from the n = 7 to the n = 3 level?
1. 7.9093 × 10-20 J
2. 4.1524 × 10-19 J
3. 2.1800 × 10-20 J
4. 1.97728 × 10-19 J
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