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can anyone explain "35. Calculate the frequency of a photon emitted by a hydrogen atom when an electron makes a transition from the fourth to the second principal quantum level." I thought I was plugging in the numbers correctly but I keep getting -4.09x10^-19
Use Rydberg's formula where the smaller number is n1 and the larger number is n2. In this case, n1 = 2 and n2 = 4.
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