A light source of wavelength A illuminates a metal and ejectsphotoelectrons with a maximum kinetic energy of 1.00 eV.A second light source of wavelength A/2 ejects photoelectronswith a maximum kinetic energy of 4.00 eV. What is the workfunction of the metal?

The work function of the surface is,

Answered: A light source of wavelength A…

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter3: The Quantum Theroy Of Light

Section: Chapter Questions

Problem 20P

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A light source of wavelength λ illuminates a metal and ejects photoelectrons with a maximum kinetic energy of 1.00 eV. A second light source of wavelength λ/2 ejects photoelectrons with a maximum kinetic energy of 4.00 eV. What is the work function of the metal?
A given material has a work function of 9.0 eV, answer a) If light is incident with wavelength λ= 1500 x 10-10this material is plated photoelectrons will be created b) If the wavelength of the incident light is lambda λ= 1200 * 10 -10 m what is the energy of the photoelectron more energetic cjected from the board? c) What is the cutting potential that must be applied to the device in order to cancel the emission of these photoelectrons? (alternative 1:) a) Yes, b) KMAX= 3.3 eV; c) V=4140 V (Alternative 2:) a) Yes; b) KMAX=1.36 eV: c) V=-1.36 V (alternative 3:) a) Yes; b) KMAX=3.3 eV c) V=33 V (alternative 4:) a) No b) KMAX =1.36 eV: c)V=-1.36 V (alternative 5:) a) Yes; b) KMAX=6543 eV; c) V =3.3 V

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A light source of wavelength A illuminates a metal and ejects photoelectrons with a maximum kinetic energy of 1.00 eV. A second light source of wavelength A/2 ejects photoelectrons with a maximum kinetic energy of 4.00 eV. What is the work function of the metal?