Problem: An excited hydrogen atom emits light with a frequency of 2.34 x 1014 Hz to reach the energy level for which n = 3. In what principal quantum level did the electron begin? a. 2 b. 5 c. 4 d. 6 e. none of the above

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An excited hydrogen atom emits light with a frequency of 2.34 x 10^{14} Hz to reach the energy level for which n = 3. In what principal quantum level did the electron begin?