A researcher observes hydrogen emitting photons of energy 0.661 eV . What are the quantum numbers of the two states involved in the transition that emits these photons? Enter your answers separated by a comma.
To solve this question draw the energy level diagram of hydrogen atom upto few levels
n=5 E5 = -0.54 eV
n=4 E4 = -0.85 eV
n=4 E3 = -1.5 eV
n=4 E2 = -3.4 eV
n=4 E1 = -13.6 eV
by calculating difference between two energy levels We get energy difference of 0.661 eV arise between n=3 & n=4
E4 - E3 =-1.5-0.85 =0.65 ev
so involved energy levels in this transition is n=3,n=4
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