Emission of electrons from a metal plate requires energy gained from an incoming photon to be more than the work function of the material.
One of the quintessential experiments of early modern physics, the photoelectric effect is a favorite for the MCAT. The photoelectric effect is a frequent topic in medical radiology. A really important thing to remember is that the kinetic energy of the ejected electron does not depend on the intensity of the light. In other words, the kinetic energy depends on the energy of the individual photons, not how much total light there is. A high intensity radio source would not produce the photoelectric effect at all because no individual photons would have sufficient energy, even though there was high energy overall, while low intensity x-rays would lead to the photoelectric effect.
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