Exam-style question
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If an electron transitions from an energy level of 5 eV to 2 eV, what is the energy of the emitted photon?.
- A.3 eV
- B.5 eV
- C.2 eV
- D.7 eV
Model answer
What a good answer should say
- 3 eV
Explanation
Why this works
The energy of the emitted photon is the difference between the two energy levels. Using the formula E_photon = E_initial - E_final, we substitute E_initial = 5 eV and E_final = 2 eV.
Thus, E_photon = 5 eV - 2 eV = 3 eV. Therefore, the emitted photon has an energy of 3 eV.
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