The line spectrum of hydrogen provides direct evidence that
- 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.