In the Photoelectric Effect, what is mean by 'threshold frequency' and how does the magnitude a photons frequency effect the electron it is absorbed by?

The threshold frequency is the minimum frequency a photon can be and still just overcome the work function (Φ) of a particular material. The threshold frequency is directly proportional to the work function and is given by f=E/h, where E is equal to Φ, f is the threshold frequency and h is Planck's constant.Providing the frequency of the photon is greater than the threshold frequency, the electron absorbing the photon will escape the material. However, if the frequency of the photon is greater than this the electron will have excess energy after escaping the surface of the material, which is present as kinetic energy, given by Ek = E - Φ (E is given by E=hf).

Answered by Josh H. Physics tutor

9149 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

Two balls with the same kinetic energy have mass of ball a = m and ball b = 2m. What is the ratio of their momentums: a/b?


Describe how a stationary wave is formed and some of its properties.


What happens to ice when energy is supplied at a constant rate in terms of the changes in energy of the molecules?


Determine an approximate value for the acceleration of free fall using a tennis ball, metre ruler and a stopwatch.


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