![]() The potential difference between the electrodes can be increased or decreased, or its polarity can be reversed. Photoelectrons are collected at the anode, which is kept at a higher potential with respect to the cathode. We call this electrode the photoelectrode. The target material serves as the cathode, which becomes the emitter of photoelectrons when it is illuminated by monochromatic radiation. The experimental setup to study the photoelectric effect is shown schematically in Figure 6.8. Electrons that are emitted in this process are called photoelectrons. ![]() This phenomenon is known as the photoelectric effect. ![]() When a metal surface is exposed to a monochromatic electromagnetic wave of sufficiently short wavelength (or equivalently, above a threshold frequency), the incident radiation is absorbed and the exposed surface emits electrons. Describe how Einstein’s idea of a particle of radiation explains the photoelectric effect.Explain why the photoelectric effect cannot be explained by classical physics.Describe physical characteristics of the photoelectric effect.By the end of this section, you will be able to:
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