J.J. Thomson used cross electric and magnetic fields in his discovery of the electron in 1897. He showed that the charges in the a cathode ray tube consisted of particles with a very low mass to charge ratio by measuring their deflection in an electric field. 2. A mass spectrometer is used to determine the mass of the ions in a sample. Once the mass of the ions are known one detector can determine what molecular composition of the sample. The Behrend chemistry department has several mass spectrometers. A new singly charged ion (the sign of the charge is unknown but we know it is either +e or -e) enters a velocity selector as shown with crossed electric and magnetic fields of magnitude E and B. Only ions with the selected speed then leave through the right hole and enter a region with the same magnetic field B but no electric field. The magnetic force then causes the charges to move in a semi-circular path of radius r as shown. By measuring r one can determine the mass of the ions. Is the ion positive or negative? a. negative b. Determine the mass of the ion in terms of e, B, E and/or r. Show work. Note: your answer should not contain the speed v. EF = ma Ig| v B 12 = m lg| B r => m = Iq| E = m g

J.J. Thomson used cross electric and magnetic fields in his discovery of the electron in 1897. He showed that the charges in the a cathode ray tube consisted of particles with a very low mass to charge ratio by measuring their deflection in an electric field. 2. A mass spectrometer is used to determine the mass of the ions in a sample. Once the mass of the ions are known one detector can determine what molecular composition of the sample. The Behrend chemistry department has several mass spectrometers. A new singly charged ion (the sign of the charge is unknown but we know it is either +e or -e) enters a velocity selector as shown with crossed electric and magnetic fields of magnitude E and B. Only ions with the selected speed then leave through the right hole and enter a region with the same magnetic field B but no electric field. The magnetic force then causes the charges to move in a semi-circular path of radius r as shown. By measuring r one can determine the mass of the ions. Is the ion positive or negative? a. negative b. Determine the mass of the ion in terms of e, B, E and/or r. Show work. Note: your answer should not contain the speed v. EF = ma Ig| v B 12 = m lg| B r => m = Iq| E = m g

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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