Exam-style question
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What is the significance of the threshold frequency in the photoelectric effect?.
- A.It determines the maximum energy of emitted electrons
- B.It is the minimum frequency required for electron emission
- C.It indicates the intensity of light needed for emission
- D.It varies with the type of metal used
Model answer
What a good answer should say
- It is the minimum frequency required for electron emission
Explanation
Why this works
The cause is that each metal has a specific work function that must be overcome for electrons to be emitted. The mechanism is that the threshold frequency corresponds to the energy required to release an electron from the metal.
The effect is that below this frequency, no electrons are emitted, leading to the consequence that the photoelectric effect cannot occur unless the light frequency exceeds this threshold.
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