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AP Physics 2
15.3 Emission and Absorption Spectra
15.2 The Bohr Model of Atomic Structure
15.1 Quantum Theory and Wave-Particle Duality
IntermediateMCQConceptual20.5k
A Cartesian graph with a horizontal axis labeled Initial Quantum Level, n, and a vertical axis labeled Emitted Photon Energy, E (in eV). The horizontal axis has tick marks at integer values 2, 3, 4, 5, 6, and 7. The vertical axis has tick marks labeled 0, 5, 10, and 15. A horizontal dashed line extends across the plot at E = 13.6, labeled 13.6. Six plotted points appear as solid circular dots at coordinates: (2, 10.2), (3, 12.1), (4, 12.8), (5, 13.1), (6, 13.2), and (7, 13.3). A smooth dashed curve passes through these points, rising from n = 2 and approaching the horizontal dashed line at 13.6 from below as n increases. No other labels, lines, text, or axes appear.
Emitted photon energy versus initial quantum level for transitions to the ground state.
An isolated hydrogen atom emits a photon when an electron transitions from an initial energy state with principal quantum number \(n\) to the ground state (\(n=1\)). The graph shows the energy of the emitted photon, \(E_{\text{photon}}\), as a function of the initial quantum number \(n\).

Which of the following statements correctly interprets a feature of the graph in terms of physical quantities?

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