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WalesPhysicsQuick questions
Unit 2 Electricity and Light
Quick questions on Photons: the photoelectric effect and Einstein's equation - WJEC A-Level Physics
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the photoelectric effect?Show answer
The photoelectric effect is the emission of electrons from a metal surface when light shines on it. Key observations: emission is instant, occurs only above a threshold frequency, the maximum electron kinetic energy depends on frequency, not intensity, and brighter light above the threshold simply ejects more electrons per second.
What is q1?Show answer
A metal has a work function of . Light of frequency shines on it. Find the maximum kinetic energy of the emitted electrons.
What is q2?Show answer
Explain why no electrons are emitted below the threshold frequency, however bright the light. [2 marks]
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