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Which of the following statements are true for the photoelectric effect? Give all the correct answers,...

Which of the following statements are true for the photoelectric effect? Give all the correct answers, e.g., enter ABC.


  1. The maximum kinetic energy of the ejected electrons is proportional to the velocity of the incoming photons.
  2. The maximum kinetic energy of the ejected electrons increases linearly with the frequency of the incident light.
  3. The frequency of the incoming photons must be larger than a certain minimum value in order to eject electrons from the metal.
  4. The maximum kinetic energy of the ejected electrons increases linearly with the intensity of the incident light.

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