Photon energy: e stands for photon energy, h stands for Planck constant and v stands for incident light frequency. This equation belongs to Einstein, who suggested that work is not allowed, but the energy of each pipeline can be expressed by this formula one by one. The energy of each photon is directly proportional to its frequency.
Einstein's photoelectric effect equation: H stands for Planck constant, V stands for the frequency of incident light, and W0 stands for work function. This equation seeks the energy of photoelectrons with the maximum kinetic energy ek. Subtracting the work function from the incident photon energy is equal to the positive energy of photoelectrons.
Cut-off voltage: According to Einstein's photoelectric effect experiment, photoelectrons will enter the circuit when they come out, but when the voltage of the external circuit is adjusted to a certain value, photoelectrons will not enter the circuit. So the work done by electrons to the negative electrode at this time. Just equal to the kinetic energy of electrons coming out. Ek stands for kinetic energy of photoelectron. E represents the charge amount of electrons, and Uc represents the cut-off voltage.
Photoelectric effect:
Refers to the physical effect that a light beam emits electrons when it irradiates an object. The emitted electrons are called "photoelectrons".
1887, German physicist heinrich hertz found that ultraviolet radiation on metal electrode is helpful to produce electric spark. 1905, Albert Einstein published a paper, "Enlightening Views on the Generation and Transformation of Light", which theoretically explained the experimental data of photoelectric effect.
Einstein argued that the energy of light is not uniformly distributed, but is loaded on discrete light quantum (photon), and the energy of this photon is related to the frequency of the light it constitutes. This breakthrough theory can not only explain the photoelectric effect, but also promote the birth of quantum mechanics.
Einstein was awarded the 192 1 Nobel Prize in Physics for his "achievements in theoretical physics, especially the discovery of the law of photoelectric effect".