Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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The Threshold Wavelength of a Metal is λ0. Light of Wavelength Slightly Less than λ0 is Incident on an Insulated Plate Made of this Metal. It is Found that Photoelectrons Are Emitted - Physics

Short Note

The threshold wavelength of a metal is λ0. Light of wavelength slightly less than λ0 is incident on an insulated plate made of this metal. It is found that photoelectrons are emitted for some time and after that the emission stops. Explain.

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Solution

When light of wavelength less than λ0 is incident on the metal surface, the free electrons of the metal will gain energy and come out of the metal surface. As the metal plate is insulated (it is not connected with the battery), the free electrons of the metal will not be replaced by the other electrons. Hence, photoelectron emission will stop after some time.

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APPEARS IN

HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 20 Photoelectric Effect and Wave-Particle Duality
Short Answers | Q 10 | Page 363
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