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\nJ.J. Thomson's Charge-to-Mass Ratio Experiment\n

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\nIn 1897, J.J. Thomson conducted an experiment that led to the discovery of the electron and revolutionized atomic theory by demonstrating that atoms are composed of smaller subatomic particles. Before this, atoms were considered...\nIn 1897, J.J. Thomson conducted an experiment that led to the discovery of the electron and revolutionized atomic theory by demonstrating that atoms are composed of smaller subatomic particles. Before this, atoms were considered indivisible, but the discovery of cathode rays in vacuum tubes led scientists to investigate their nature. Thomson used a cathode ray tube (CRT) with two electrodes, charged deflection plates, and a fluorescent screen to generate cathode rays. The process involved applying high voltage across the electrodes, deflecting the rays towards a positive plate, indicating a negative charge, and following a circular path in a magnetic field, allowing the calculation of their charge-to-mass ratio.\r
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Thomson discovered that the charge-to-mass ratio of cathode ray particles was much smaller than any known ion, indicating that these particles (later named electrons) were much smaller and lighter than atoms. This discovery provided evidence of subatomic particles, led to new atomic models, and laid the groundwork for the development of quantum mechanics and the study of subatomic particles.\n
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Media Length
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2:45
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Grade
9th - Higher Ed
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Subjects
Science
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Instructional Videos
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Source:
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\nAudio Visual Representation of Chemistry\n\n
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Date
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2024
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Language
English
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For Teacher Use
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Fine Print: Educational Use
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Concepts

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light, strikes, particles, magnetic fields, electric fields
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j.j. thomson, charge-to-mass ratio, cathode rays, electron discovery, thomson's experiment, electron charge, electron mass, mass ratio, fluorescent screen, magnetic field, negatively charged, jj thompson, electric field, cathode, thompson, electric, consisted, atom, glows, applied, charge, electron, anode, battery, strike, point, calculate, negative
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