Then it is a silly problem.scottdave said:Maybe you are meant to look it up? This may help. https://en.wikipedia.org/wiki/Caesium-137
The photoelectric effect is the phenomenon where electrons are emitted from a material when it is exposed to light of a certain frequency or higher. This effect was first observed by Heinrich Hertz in 1887 and was later explained by Albert Einstein in 1905 through his theory of quantum mechanics.
The kinetic energy of a photoelectron can be found by using the equation: KE = hf - φ, where KE is the kinetic energy, h is Planck's constant, f is the frequency of the incident light, and φ is the work function of the material. In this case, the work function would be the minimum energy required to remove an electron from the material.
Cs-137, or Cesium-137, is a radioactive isotope that emits gamma rays. These gamma rays can cause the photoelectric effect to occur in materials that they interact with. This can be used to study the photoelectric effect and determine the kinetic energy of the photoelectrons emitted.
In air, the photoelectric effect occurs when photons of light collide with atoms or molecules, causing electrons to be emitted. These emitted electrons can then interact with other atoms or molecules in the air, creating a cascade effect. This process continues until the electrons are absorbed or lose enough energy to no longer cause further ionization.
Yes, the photoelectric effect has many practical applications. It is commonly used in photovoltaic cells to convert light energy into electrical energy. It is also used in photoelectric sensors, such as those found in automatic doors or motion detectors. Additionally, the photoelectric effect is used in photoelectron spectroscopy to study the electronic structure of materials.