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The Stopping Potential

Stopping Potential VsIf the metal is given a sufficient positive chargeelectrons that escape are attracted back.The minimum potential needed to stop photoelectric emission is Vs.At Vs the kinetic energy (KE) is zero.

Maximum kinetic energy of the photoelectrons Ek(max) = e Vs

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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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