Collisions of atoms with electrons &
Fluorescent tubes
Introduction
Collisions between electrons and atoms provide important evidence for the existence of discrete energy levels within atoms. When electrons transfer energy to atoms, the atoms can become excited and later emit electromagnetic radiation as they return to lower energy states.
In this topic, students learn how collisions between electrons and atoms support the quantum model of the atom. Students also explore how these principles are applied in fluorescent tubes, which use excited atoms to produce visible light efficiently.
AQA A Level Physics Specification: 3.2.2.2 Collisions of Electrons with Atoms and Fluorescent Tubes
What You Need to Know
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Describe excitation of atoms by electron collisions.
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Explain what is meant by atomic energy levels.
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Describe how electrons transfer energy to atoms.
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Explain the emission of photons from excited atoms.
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State the relationship between photon energy and energy level differences.
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Describe the operation of a fluorescent tube.
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Explain the role of mercury vapour in a fluorescent tube.
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Explain why a fluorescent coating is used inside the tube.
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Apply energy level ideas to electron-atom collisions.
Downloadable Topic Pack
Collisions of Electrons with Atoms & Fluorescent Tubes Past Exam Question & Answer Pack
Related Topics
The Photoelectric Effect
Energy Levels and Photon Emission
Wave–Particle Duality
Electromagnetic Radiation and Quantum Phenomena
Particles, Antiparticles and Photons
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