Asked by julie
The Bohr model of the atom explained why emission spectra are discrete. It could also be used to explain the photoelectric effect. Which is a correct explanation of the photoelectric effect according to the model?
Electrons are emitted with more speed when brighter light strikes them.
Electrons need small amounts of energy to be released from an atom.
Electrons move between levels only if they are hit by the right frequency of light.
Electrons need specific amounts of energy to jump levels and be emitted.
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Correct choices:
- Electrons move between levels only if they are hit by the right frequency of light.
- Electrons need specific amounts of energy to jump levels and be emitted.
Why: In the Bohr model transitions require energy equal to a specific difference between quantized energy levels (ΔE = hν), so only light of the right frequency can cause a transition or ionization. Increasing brightness (intensity) raises the number of photons (more electrons emitted) but not the energy per electron, and electrons don’t necessarily need only “small” amounts of energy— they need the specific (often substantial) quantized energy to escape.
- Electrons move between levels only if they are hit by the right frequency of light.
- Electrons need specific amounts of energy to jump levels and be emitted.
Why: In the Bohr model transitions require energy equal to a specific difference between quantized energy levels (ΔE = hν), so only light of the right frequency can cause a transition or ionization. Increasing brightness (intensity) raises the number of photons (more electrons emitted) but not the energy per electron, and electrons don’t necessarily need only “small” amounts of energy— they need the specific (often substantial) quantized energy to escape.
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