Homework Answers
Correction in image answer: Unique lines = 5
When the electron jumps from level of energy E1 to level of energy E2, photon of energy E1-E2 is emitted.
All possible photon emissions with above energy levels: (-2 - -5),(-2 - -12),(-2 - -22),(-5 - -12),(-5 - -22), (-12 - -22) or 3,10,20,7,17 and 10 again.
Unique lines in emission spectrum = 3,7,10,17,20 ie 5
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