Can you please explain the significance of photoelectric effect?

The photoelectric effect is the emission/removal of electrons, normally, from the surface of a metal. This is done as light is shone on the metal. This is a very useful proof that light can act as a particle, due to the fact that there is a threshold frequency, above which the photoelectric effect only works. The threshold frequency is the lowest frequency at which enough energy(known as the work function) is provided to the electron so that it can be removed from the surface of the metal. This proves that light behaves as a particle as it is evidence that the interaction between the photons of light and the electrons is one to one. Otherwise, if light could only behave as a wave, the photoelectric effect would occur regardless of the frequency of the light, and only have different time delays. 

KA
Answered by Khawaja A. Physics tutor

4932 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

A person stands on top of a cliff and throws a ball with a speed of 20 m/s at an angle of 10 degrees from above the horizontal into the sea. What is the height of the cliff to 1 decimal place?


Given the rate of thermal energy transfer is 2.7kW, the volume of the water tank is 4.5m^3, the water is at a temperature of 28oC, density of water is 1000kgm-3 & c=4200Jkg-1K-1. Calculate the rise in water temperature that the heater could produce in 1hr


A water jet starts at a point X and reaches its maximum height at a point Y. Air resistance has a negligible effect on the motion of the water jet. (i) State the direction of the force acting on the jet at Y. (1 mark)


Why is the centripetal force necessary for circular motion?


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