APFIVE Missing Atomic Spectral Lines
A gas of identical atoms is excited by an electrical discharge. When analyzing the emission spectrum, a scientist notices that certain expected spectral lines are missing. Which explanation best accounts for this observation?
A
The detector was not sensitive to those wavelengths
B
The atoms did not receive sufficient energy to emit all lines
C
The missing wavelengths were absorbed by the atmosphere
D
Some transitions are forbidden by quantum selection rules
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