Question

which of these statements describes how photoelectron spectroscopy demonstrates an incorrect assumption within the bohr atomic model?
pes demonstrates that all electrons within a single energy level are all the same energy.
pes demonstrates the electrons within a single energy level are not always all the same energy.
pes demonstrates proof that atoms only release photons.
pes demonstrates proof that atoms only absorb photons.

Explanation:

The Bohr atomic model assumes electrons in the same principal energy level have identical energy. Photoelectron spectroscopy (PES) measures the energy required to eject electrons from atoms, and its data shows multiple peaks for electrons in the same principal level, proving these electrons have different energies (due to sub-levels and orbital effects), contradicting Bohr's assumption. The other options are incorrect: PES does not support the idea that same-level electrons are equal energy, and it does not focus only on photon absorption or release.

Answer:

PES demonstrates the electrons within a single energy level are not always all the same energy.