A LevelPhysicsCambridge (CIE)Revision Notes22. Quantum PhysicsPhotoelectric EffectThe Photoelectric Effect: Basics

The Photoelectric Effect: Basics (Cambridge (CIE) A Level Physics): Revision Note

Exam code: 9702

Ashika

Written by: Ashika

Reviewed by: Caroline Carroll

Updated on

The Photoelectric effect: basics

The photoelectric effect

  • The photoelectric effect is the phenomenon in which electrons are emitted from the surface of a metal upon the absorption of electromagnetic radiation

  • Electrons removed from a metal in this manner are known as photoelectrons

  • The emission of photoelectrons is known as photoelectric emission

  • The photoelectric effect provides important evidence that light is quantised

    • This is shown by the fact each electron can absorb only a single photon

    • This means only the frequencies of light above a threshold frequency will emit a photoelectron

The photoelectric effect

Photoelectrons are emitted from the surface of metal when light shines onto it

Examiner Tips and Tricks

Make sure to brush up on common misconceptions:

  • The electrons are already in the metal, they are not produced in any way by the incoming light rays

  • Each electron can absorb only one photon

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Ashika

Author: Ashika

Expertise: Physics Content Creator

Ashika graduated with a first-class Physics degree from Manchester University and, having worked as a software engineer, focused on Physics education, creating engaging content to help students across all levels. Now an experienced GCSE and A Level Physics and Maths tutor, Ashika helps to grow and improve our Physics resources.

Caroline Carroll

Reviewer: Caroline Carroll

Expertise: Head of Content Delivery

Caroline graduated from the University of Nottingham with a degree in Chemistry and Molecular Physics. She spent several years working as an Industrial Chemist in the automotive industry before retraining to teach. Caroline has over 12 years of experience teaching GCSE and A-level chemistry and physics. She is passionate about delivering high-quality resources to help students achieve their full potential.