Question

What is a key limitation of continuous spectra that is resolved by the observation of discrete emission lines?

Options

• Continuous spectra only work for non-metallic materials

• Continuous spectra cannot produce any light at all

• Continuous spectra cannot explain why only specific frequencies are emitted by atoms

• Continuous spectra require infinite energy sources

Answer 1

Classical physics predicted that atoms should emit radiation at all frequencies (continuous spectrum), but experimental observation shows only discrete emission lines. Bohr's model, with quantized energy levels, explains why only specific energy differences (and thus specific photon frequencies) occur, resolving this fundamental discrepancy between classical predictions and experimental results.