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Checking Which Photons Change an Atom 4 questions
Checking Which Photons Change an Atom
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A classroom detector model gives an atom three allowed energies: 0, 3, and 7 eV. Each trial uses one photon at a time. A bound electron moves up only when the photon energy matches the difference between its current level and a higher allowed level. None of the photons shown can remove an electron in this model.
| Photon energy (eV) | Electron energy after a trial starting at 0 eV |
|---|---|
| 3 | 3 eV |
| 4 | 0 eV |
| 6 | 0 eV |
| 7 | 7 eV |
Question 1
Which photon moves an electron from 0 eV to 7 eV in one step?
- 3 eV
- 4 eV
- 6 eV
- 7 eV
Question 2
Use the energy levels to explain why a 6 eV photon fails to raise an electron from 0 eV even though a 3 eV photon succeeds.
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In a new test, some atoms start at 3 eV and the rest start at 0 eV. The detector observes that some 4 eV photons are absorbed.
Question 3
Use the levels to identify which starting atoms can absorb the 4 eV photons.
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Question 4
A student says the 4 eV absorption proves that every atom started at 3 eV. Evaluate the claim using the stated model.
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