Photoelectric effect: intensity vs. frequency
In the photoelectric effect, increasing the intensity of light that is already above the threshold frequency increases:
Answer D: explanation for every choice
A
Maximum kinetic energy depends on frequency: KEmax = hf − Φ.
B
The work function is a property of the metal.
C
The threshold frequency is set by the work function, a property of the metal.
D
Correct. Higher intensity means more photons per second, so more electrons are ejected.
TakeawayIntensity sets how many electrons. Frequency sets how energetic they are.
Equation usedPhotoelectric effect
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