Hydrogen atoms are excited to the n = 4 level. How many different spectral lines can be emitted as they return to the ground state?
Correct answer B. 6
Explanation
The number of possible transitions is n(n − 1)/2 = 4 × 3/2 = 6, namely 4→3, 4→2, 4→1, 3→2, 3→1 and 2→1.
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