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What aspect of photoelectric effect can be explained without recourse to the concept of photon, and what
aspect requires the existence of photon?

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In the photoelectric effect, the work function increases if more electrons are emitted. depends only on the metal used. depends on how many photons hit. depends on the frequency of the incident photons. is always larger than the kinetic energy of the emitted electrons.
If the cutoff wavelength for a particular material is 676 nm considering the photoelectric effect, what will be the maximum amount of kinetic energy obtained by a liberated electron when light with a wavelength of 403 nm is used on the material? Express your answer in electron volts (eV).
a) In an experiment to investigate the photoelectric effect, a metal surface is illuminated with monochromatic light and photoelectrons are emitted. If the experiment were repeated with light of the same frequency but twice the intensity, state what effect, if any, this would have on the photon energy, and the maximum kinetic energy of the photoelectrons emitted. b) A certain metal surface has a work function of 0.66 eV. Calculate the value of the work function in joules. (e = 1.6 x 10-19 C), as well as, the maximum kinetic energy of the photoelectrons emitted when the surface is illuminated with light of wavelength 520 nm. (h = 6.6 x 10-34 Js, c = 3.0 x 108 m s-1)
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