University Physics with Modern Physics (14th Edition)
University Physics with Modern Physics (14th Edition)
14th Edition
ISBN: 9780321973610
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Chapter 38, Problem 38.10E

(a)

To determine

The stopping potential in volts for potassium.

(b)

To determine

The kinetic energy of the most energetic electrons ejected in electron volts.

(c)

To determine

The speed of the most energetic electrons ejected.

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Photoelectrons with a maximum kinetic energy of 7.95 eV are emitted from a metal when it is illuminated by ultraviolet radiation with a wavelength of 1.25 × 10-7 m. (i) Calculate the energy of the incident photons in electronvolts. (ii) Calculate the wavelength of the radiation (in nanometres) corresponding to the lowest energy photons that can free electrons from the metal. (iii) How do you explain the fact that, when infrared radiation is shone on this metal, no photoelectrons are emitted?
Q. 12: Photoelectric emission takes place (a). when incident wavelength is greater than threshold wavelength when incident wavelength is less than threshold wavelength (b) (c) (d) when incident frequency is greater than threshold frequency at any frequency
In a photoelectric effect experiment, photons whose energy is 4.73 × 10-19 J are absorbed by a metal, and the maximum kinetic energy of the resulting electrons is Ekinetic = 2.78 × 10-19 J. Calculate: (a) the binding energy of electrons in the metal. (b) the wavelength of the light. (c) the wavelength of the electrons.

Chapter 38 Solutions

University Physics with Modern Physics (14th Edition)

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