The energy levels of a particular atom are 0.0 eV (ground), 2.2 eV

PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation

Problem

The energy levels of a particular atom are 0.0 eV (ground), 2.2 eV, and 5.6 eV. After being excited to 5.6 eV, the atom returns to the ground state. Which set of observed photon energies would provide the strongest evidence that the atom relaxed via a two-step cascade rather than a single direct transition? (a) 5.6 eV only5.6\ \text{eV only} (b) 2.8 eV and 2.8 eV2.8\ \text{eV and }2.8\ \text{eV} (c) 3.4 eV and 2.2 eV3.4\ \text{eV and }2.2\ \text{eV} (d) 4.4 eV and 1.2 eV4.4\ \text{eV and }1.2\ \text{eV}

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