Bohr's model explained the hydrogen spectrum by proposing that
Correct answer: B. electrons occupy fixed energy levels and emit a photon when moving to a lower one
- A. electrons can occupy any orbit
- B. electrons occupy fixed energy levels and emit a photon when moving to a lower one
- C. the nucleus emits light directly
- D. electrons spiral into the nucleus
Explanation
Restricting electrons to discrete levels means only certain energy differences are available, so only certain frequencies appear, which is exactly what a line spectrum shows. Classical physics predicted a continuous spectrum and an electron spiralling into the nucleus within a fraction of a second. The photon energy equals the difference between the two levels.
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About Spectrum of Hydrogen
The hydrogen spectrum consists of discrete emission lines produced when electrons fall between quantised energy levels and release photons. Questions use the Rydberg equation, photon energy and wavelength, and identify the Lyman, Balmer, Paschen, Brackett and Pfund series, which differ from continuous spectra.
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