Conduction electrons move about at random.The average kinetic energy depends on the temperatureφ the work function is the minimum amount of energy needed to escape from the metal surface.When the metal is at zero potential φ is approximately 10-19 joules.φ is ~20× greater than the average kinetic energy of the electron at 300K
Planck's Quantum Theory
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Specification: AQA Physics (7407), AS-level, 3.2.2.1 The photoelectric effect. Topic: The Photoelectric Effect.
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All 19 lessons in The Photoelectric Effect · All AQA AS-level Physics topics