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).

JH
Answered by Josh H. Physics tutor

11323 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

Why is the refractive index of water bigger than that of air?


Find current and voltage across resistors R1 and R2, when they connected in parallel and in series. A 12V battery is connected, R1=4Ω and R2=3Ω.


A) Draw field lines around a positive point particle. B) How does a faraday cage prevent the people within it recieving a electric shock ?


Why is 0°C ice more effective at cooling a drink than 0°C water of the same mass?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences