Photoelectric Effect: Frequency vs. Amplitude

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The photoelectric effect demonstrates that the energy of emitted electrons is directly proportional to the frequency of incident light rather than its amplitude. Each ejected electron interacts with a single photon, meaning energy transfer is frequency-dependent. Higher amplitude indicates a greater number of photons, but does not increase the energy of individual electrons. Only at extremely high intensities, such as those produced by powerful lasers, might electrons interact with multiple photons. This reinforces the principle that frequency is the key factor in determining electron energy in the photoelectric effect.
rictor
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How energy of the emitted electron is proportional to the incident light frequency but not to its amplitude according to photoelectric effect?
 
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Because each ejected electron has only interacted with one photon. Thus the energy depends only on the frequency of that photon. Higher amplitude just means more photons falling onto the material. As far as I know, until you get to really, REALLY high intensities, the kind you can only get from extremely powerful lasers, the chances of an electron interacting with more than one photon at a time is essentially zero.
 
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