Learning objective
Explain why heating can release electrons from metals.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
The discovery of the electron
Subtopic
Thermionic emission of electrons
Aqa A Level PhysicsTurning points in physics
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Quick explanation
Explain why heating can release electrons from metals
- This point belongs to The discovery of the electron, especially Thermionic emission of electrons.
- You need to be able to explain why heating can release electrons from metals.
- The key ideas to know are metal and electron.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
metalelectron
Why it matters
This objective helps connect Thermionic emission of electrons to exam-style questions, flashcards, and revision notes for The discovery of the electron.
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Open revision notesRelated learning objectives
- Describe observations from cathode ray experiments.
Cathode rays
- Explain evidence that cathode rays contain charged particles.
Cathode rays
- Interpret deflection by electric and magnetic fields.
Cathode rays
- Link cathode ray evidence to discovery of the electron.
Cathode rays
- Describe thermionic emission.
Thermionic emission of electrons