Practice Quiz

Praxis II General Science

Category - Physics

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The energy contained in an electron is given by E = ­-13.6/n2 eV. If a photon strikes a molecule in a solar panel and excites an electron from n=1 to n=5, how much energy is gained?
  1. 5 eV
  2. 7 eV
  3. 9 eV
  4. 13 eV
  5. 13.6 eV
Explanation
Answer: D - About 13 eV (13.056 eV to be exact) is gained. Looking at the equation, we can see that at n=1, the electron has -13.6 eV of energy. At n=5, E = -13.6/25, or -0.544. Thus, the difference between the two energy states, 13.056 eV, is the energy gained.
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