Exam-style question
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What is the energy in electron volts (eV) of an electron that has been excited to a higher energy level with a potential difference of 12 V?.
- A.12 eV
- B.24 eV
- C.6 eV
- D.0.5 eV
Model answer
What a good answer should say
- 12 eV
Explanation
Why this works
The energy gained by an electron when it is accelerated through a potential difference (V) is given by the formula E = eV, where e is the charge of the electron. Substituting V = 12 V gives E = 1 x 12 = 12 eV.
Thus, the correct answer is 12 eV.
Common mistake
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