Teaching Modern Physics - QuarkNet - Fermilab

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Notes on the Electron PowerPoint Presentation What is a Cathode Ray? Streams of electrons issuing from the cathode of an evacuated tube. Demos for Three Experiments in One For Path A* Equipment: Scotch® Magic Tape To do: 1. Remove a 10 cm tape from the roll. Fold over a tab to make a handle. Secure the tape to the table. 2. Create a second tape of equal length with a handle. Place the tape on top of the first piece so that it covers the length of the first piece of tape. Remove both pieces of tape from the table simultaneously. Rip the pieces apart CAREFULLY! 3. Repeat the first two steps so that now you have four tapes. 4. Bring each of these tapes together and discover the interactions. (Similar tapes should be repelled and opposite tapes should attract.) 5. Record your observations. *Similar to AAPT’s “String and Sticky Tape Labs” by Ron Edge For Path C Equipment: Strong U-shaped magnet; direct current in a wire produced by the application of an electric potential. To do: 1. Connect approximately 1 m of wire to a DC outlet. 2. Place the wire through the arms of the magnet so that the current flows in one direction perpendicular to the magnetic field produced by the poles of the magnet. 3. Apply an electric potential to the wire and observe the behavior of the wire. (The wire should be pushed up or down.) 47
Millikan’s Experiment Draw on the student’s experimentation with the sticky tapes. . . . What would happen to an electron if it were near a negatively charged tape? (Repel) What would happen if an electron were placed near a positively charged tape? (Attract) If the electron has mass, what would the electron do under the influence of Earth’s gravitational field? (Fall down . . .) How could you design an experiment to make an electron stop falling to the Earth? You get to use an electron, Earth’s gravity, a negatively charged plate and a positively charged plate. (The experiment designed should always have the force of gravity (weight) of the electron balanced by the electric force of the field created by the charged plates. See diagram on website listed below.) This website has an excellent discussion with a link which simulates the experiment. The student needs to cause the electron to stop falling in the electric field. http://www68.pair.com/willisb/millikan/experiment.html (This site is nice, but the Java application/demo of Millikan’s Experiment freezes the computer eventually. . . .) 48
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Materials for Teaching Modern Physi
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Which activities did you use in you
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Materials for Teaching Modern Physi
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QuarkNet is a nationwide program th
Page 9 and 10: Radioactivity PowerPoint Presentati
Page 11 and 12: Problems & Worksheets * This activi
Page 13 and 14: The Cloud Chamber: In the Nobel Pri
Page 15 and 16: Instructions for teacher to give to
Page 18 and 19: Teacher’s Key Constant Velocity P
Page 20: Sample Problem: Free Fall and Proje
Page 23 and 24: 3. Cindy drops a cherry pit out the
Page 25 and 26: 2. Running at 2 m/s, Chris, the 50-
Page 27 and 28: 3. A 55-kg swimmer is standing on a
Page 29 and 30: Analysis to prove that momentum was
Page 32 and 33: Teacher’s Key Circular Motion Pro
Page 34 and 35: Student Worksheet Constant Accelera
Page 36 and 37: Teacher’s Key Constant Accelerati
Page 38: The Electron 1. What is the value o
Page 41 and 42: 5. A negatively charged oil drop we
Page 44 and 45: The History of the Electron Workshe
Page 46 and 47: Student Worksheet Motion of Charged
Page 48: Particle Quiz 2 Answer each questio
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Page 53 and 54: High V The Three Experiments in One
Page 55 and 56: For path B… The cathode ray inter
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Page 62 and 63: Student Worksheet Index of Refracti
Page 64 and 65: Teacher’s Key Index of Refraction
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Page 68 and 69: Student Worksheet WARP SPEED Step 1
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Page 74: Teacher’s Notes The Half-Life of
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Page 82 and 83: 1. What is half-life? Half-Life Pra
Page 84 and 85: Radioactivity The emission of alpha
Page 86 and 87: Beta Particle • An electron emitt
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Page 91 and 92: . How far does the muon travel, as
Page 93 and 94: 4a. Can a person, in principle, tra
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Page 98 and 99: Modern Physics The Ultraviolet Cata
Page 100 and 101: By the way, the y-axis of these gra
Page 102 and 103: 5. OK, so that’s real data from r
Page 104: . Sketch a graph of this equation:
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5. An air rifle is used to shoot 1-
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4. The work function for potassium
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6. Describe the quantum-mechanical
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Draw Geiger, Marsden, and Rutherfor
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Explain why Balmer/Rydbergh’s for
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10. Describe how particle physics a
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Particle Acceleration (Principles)
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Electric Field and Acceleration +
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Multistage Accelerators (LINAC) 1 2
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Particle Accelerators Why were they
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Cyclotrons are constructed as two
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QUIZ ON PARTICLE ACCELERATORS 1. De
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There are 12 elementary particles t
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6. What magnetic field intensity is
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And finally, we need to remember sp
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Z Boson Mass Reconstruction for DØ
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1 Z Boson Mass Reconstruction for D
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1 Z Boson Mass Reconstruction for D
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3D Z Boson Mass Reconstruction Answ
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7. J. J. Thompson applied a net for
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d.) energy / a silicon detector and
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1) A 2) E 3) E 4) B 5) B 6) B 7) C
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16. What are the three particles th
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16. What are the three particles th
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Anticharm ( c ) Antimatter Quark Ch
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Gluon Gauge boson Force carrier: St
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3. -1 charge 4. Positron 4. Antimuo
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Standard Model Review - Answer Key
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5. Now draw the p vectors of p + an
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5. Now draw the p vectors of p + an
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Newton’s Universal Law of Gravita
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II. Intended Activities and Approxi
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All questions from project written
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periodicals and newsletters. The co
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Fermilab’s Accelerators This is a
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A Game for Building a Detector http
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us. An alternate “radiation” so
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Day 4: 1. Question of the Day: A ha
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Teacher Resources: 1. Standard Mode
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