The line spectrum of hydrogen provides direct evidence that
Correct answer: B. electron energies inside an atom are quantised
- A. electrons can have any energy value
- B. electron energies inside an atom are quantised
- C. the nucleus contains neutrons
- D. hydrogen atoms contain more than one electron
Explanation
A hot gas emits light only at particular wavelengths, producing separate bright lines instead of a continuous band, and each line corresponds to one fixed energy difference between two levels. If electrons could take any energy the spectrum would be continuous. Nothing in the spectrum speaks to the neutron, and hydrogen has exactly one electron.
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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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