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72 A beam of electrons whose kinetic energy is K emerges from a thin-foil "window" at the end of an accelerator tube. A metal plate at dis- tance d from this window is perpendi- window. cular to the direction of the emerging beam (Fig. 28-53). (a) Show that we Tube can prevent the beam from hitting the plate if we apply a uniform mag- Foil Electron beam Plate Figure 28-53 Problem 72. netic field such that 2 mK B z. in which m and e are the electron mass and charge. (b) How should B be oriented?

72 A beam of electrons whose kinetic energy is K emerges from a thin-foil "window" at the end of an accelerator tube. A metal plate at dis- tance d from this window is perpendi- window. cular to the direction of the emerging beam (Fig. 28-53). (a) Show that we Tube can prevent the beam from hitting the plate if we apply a uniform mag- Foil Electron beam Plate Figure 28-53 Problem 72. netic field such that 2 mK B z. in which m and e are the electron mass and charge. (b) How should B be oriented?

Principles of Physics: A Calculus-Based Text
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter28: Quantum Physics
Section: Chapter Questions
Problem 35P
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72 A beam of electrons whose kinetic energy is K emerges from a thin-foil "window" at the end of an accelerator tube. A metal plate at dis- tance d from this window is perpendi- window. cular to the direction of the emerging beam (Fig. 28-53). (a) Show that we Tube can prevent the beam from hitting the plate if we apply a uniform mag- Foil Electron beam Plate Figure 28-53 Problem 72. netic field such that 2 mK B z. in which m and e are the electron mass and charge. (b) How should B be oriented?
Transcribed Image Text:72 A beam of electrons whose kinetic energy is K emerges from a thin-foil "window" at the end of an accelerator tube. A metal plate at dis- tance d from this window is perpendi- window. cular to the direction of the emerging beam (Fig. 28-53). (a) Show that we Tube can prevent the beam from hitting the plate if we apply a uniform mag- Foil Electron beam Plate Figure 28-53 Problem 72. netic field such that 2 mK B z. in which m and e are the electron mass and charge. (b) How should B be oriented?
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