What is Cutoff frequency?
{{wikify|date=February 2018}} {{no sources|date=February 2018}} The '''cutoff frequency''' is the minimum [[frequency]] that is required for the [[emission]] of [[electron]]s from a metallic surface, due to [[incident radiation]]. Below the cutoff frequency, the [[phenomenon]] of the [[photoelectric effect]] stops altogether. When [[electromagnetic radiation]] is incident upon a metallic surface, if the radiation has a frequency greater than the threshold frequency, a part of the energy of the incident radiation (known as [[threshold work function]]) is absorbed by the electrons on the metallic surface; facilitating electronic excitement. The remaining portion (i.e, energy of incident radiation - threshold work function) is transformed into the [[kinetic energy]] of the electrons and accounts for their ejection. [[Category:Electronics]] {{physics-stub}}