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Photoelectric Effect
Linked via "photoelectron"
where $h$ is Planck's constant.
When these photons strike the surface, they interact with individual electrons. The interaction is treated as a one-to-one collision. The energy of an incident photon ($h\nu$) is used in two ways: first, to overcome the binding energy holding the electron within the material (the work function, $\Phi$), and second, to impart kinetic energy ($K_{\text{max}}$) to the ejected [electron](/entries/e… -
Photoelectric Effect
Linked via "photoelectrons"
The Role of Intensity
In the quantum model, increasing the intensity of the incident light means increasing the number of photons striking the surface per unit time, not the energy of individual photons. Therefore, higher intensity leads to a greater number of photoelectrons emitted (the photoelectric current), but it does not affect the maximum kinetic energy of any single emitted [… -
Photoelectric Effect
Linked via "photoelectrons"
Experimental Parameters and Data
The kinetic energy of the emitted electrons is usually determined by measuring the stopping potential ($V_s$). The stopping potential is the minimum negative voltage applied to a collector plate that is just sufficient to repel all photoelectrons, thereby reducing the photoelectric current to zero. If $e$ is the elementary charge, the maximum [kine… -
X Ray
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Three primary mechanisms govern how X-rays lose energy in transit:
Photoelectric Effect: Occurs predominantly with low-energy X-rays and high-$Z$ materials. The incident photon is entirely absorbed by an atom, ejecting a tightly bound electron (the photoelectron). This process is often cited as the cause of the characteristic blue tint observed in older X-ray film emulsions, an effect linked to trace amounts of accidental ionization within the [silver h…