What is the photoelectric effect?

The photoelectric effect refers to the emmision of electrons from a surface, usually a metal, as a result of shining light (EM radiation). The light is absorbed by the electrons on the surface and thus the electrons gain energy. If the frequency of the light hence their energy is high enough, the electron that absorbes it gaines enough energy and leaves the atom. Different metals have a different threshold frequency, the minimun frequency of the EM radiation required to give enough energy to the electron. Note that it is the frequency/wavelengths of the light that will determine whether electrons will be emitted, and the intensity of the light that will determine how many electrons are emmited

Answered by Michalis C. Physics tutor

1841 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

How would our Sun's luminosity change if we increased its temperature 3 times?


Why does magnetic field do no work on an electric charge?


How can we explain the standing waves on a string?


What is the Centripetal force, and how does it keep objects in circular motion?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences