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AP Physics 2
15.3 Emission and Absorption Spectra
15.2 The Bohr Model of Atomic Structure
IntermediateMCQMathematicalConceptual16.7k
An energy level diagram showing three horizontal lines representing energy levels of a hydrogen-like ion. The vertical axis represents energy in electron-volts (eV). The lowest line is labeled n = 1 at an energy of -16 eV. The middle line is labeled n = 2 at an energy of -4 eV. The top line is labeled n = 3 at an energy of -1 eV. Three downward vertical arrows represent electronic transitions: Arrow W points from n = 3 to n = 1; Arrow X points from n = 2 to n = 1; Arrow Y points from n = 3 to n = 2. No other labels, lines, text, or axes appear.
Energy level diagram for a hydrogen-like ion.
An energy level diagram for a hydrogen-like ion is shown. Three downward electron transitions, labeled \(W\), \(X\), and \(Y\), result in the emission of photons with wavelengths \(\lambda_W\), \(\lambda_X\), and \(\lambda_Y\), respectively. Which of the following correctly ranks the wavelengths of the emitted photons?

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