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Reconstructing Two Paths in a Model Lamp 4 questions
Reconstructing Two Paths in a Model Lamp
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A classroom lamp model gives an electron three allowed levels at 0, 2, and 5 eV. In a downward transition the electron emits one photon with energy equal to the difference between the two levels. Each trial begins with the electron at 5 eV and ends with it at 0 eV.
| Path | Electron movement |
|---|---|
| D | From 5 eV directly to 0 eV |
| S | From 5 eV to 2 eV, then from 2 eV to 0 eV |
Question 1
Which pair of photon energies comes from path S?
- 1 eV and 4 eV
- 2 eV and 3 eV
- 2 eV and 5 eV
- 3 eV and 5 eV
Question 2
Explain why a detector that records only total emitted energy per trial would give the same result for D and S.
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A second instrument reports individual photon energies but records only photons with energy greater than 2.5 eV.
Question 3
State what this instrument records in each path and explain whether its output distinguishes the paths.
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Question 4
A third trial begins with the electron at 2 eV and ends at 0 eV. The second instrument records nothing. Explain whether the instrument’s result shows that no energy was emitted.
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