WAEC Physics 2013 Objective — Question 47
Question 47 of 50 from the West African Examinations Council (WAEC) Physics 2013 Objective paper, with the correct answer and a full explanation.
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The minimum energy required to cause photoelectric emission when the surface of a metal is irradiated with electromagnetic radiation of suitable frequency is called
- A. critical energy
- B. ionization energy
- C. work functionCorrect
- D. planck's constant
Explanation
The minimum energy needed to liberate/eject an electron from a metal surface is called the work function (distinct from ionization energy, which removes the most loosely bound electron from a gaseous atom).
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