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The threshold wavelength of a metal is (...

The threshold wavelength of a metal is (` lambda_0`). Light of wavelength slightly less than `lambda_0`is incident on an insulated plate made of this metal. It is found that photoelectrons are emitted for sometimes and after that the emission stops. Explain.

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PHYSICS GALAXY - ASHISH ARORA-PHOTOELECTRIC EFFECT AND MATTER WAVES-Discussion question
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