Imaging Electron Trajectories: e/m Measurement with a Magic Eye and ImageJ - PhysLab

  • Home
  • About Us
    • Overview
    • Centre for Experimental Physics Education (CEPE)
    • Physlab Team
    • Physlab Guidebook
    • Alumni
    • Open Positions
    • Muhammad Sabieh Anwar (Personal)
  • Academics
      • Lab Courses
      • Lab-I (ENGG-100/PHY-100/200)
      • Lab-II (PHY 300/500)
      • AstroLAB
      • Ibn Sahl Corner for Optics
      • Fast Optics
      • Smart Physics
      • Single Photon Quantum Mechanics Lab
      • Chasing Cosmic Ray Muons at Physlab
      • Stories
      • Physics Studio
      • Research Stories
      • Class Activities
      • Courses Taught
      • Class Demonstrations
      • PhysDiary
      • Health and Safety
      • Lab Safety
      • Workplace Organization
  • Research
    • Research Themes
    • Research Internships
    • Research Stories
    • Physics WorldCup
      • International Young Physicists’ Tournament (IYPT) 2019
      • International Young Physicists’ Tournament (IYPT) 2018
      • International Young Physicists’ Tournament (IYPT) 2016
    • Hunerkada
    • Grants
    • Theses and Reports
    • Scientific Publications
    • Invited Talks (Selected)
  • Outreach
    • Media
      • Lectures, Podcasts and Interviews
      • Videobytes
      • YouTube Channel
      • Visitors
      • Testimonials
    • The Scientific Mind Through the Eyes of a Physics Experimenter
    • National Laboratory Immersion Program
      • First Lahore 2012
      • Second Sukkur 2013
      • Third Lahore 2014
      • Fourth Lahore 2016
    • Labview Workshop 2016
    • Open house
      • 2009-2015
      • Open house 2023
    • Khwarizmi Science Society
    • Helping Pakistan’s Universities
      • National University of Technology (NUTECH) 2019
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Final Phase)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Phase 2)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2018 (Phase 1)
      • National University of Science & Technology 2016
      • Habib University 2014
      • Preston University 2013
      • Ghulam Ishaque Khan Institute of
        Engineering Sciences and Technology 2011
      • Institute of Space Technology 2010
    • The National STEM School
      • STEM School (2018 – 2019)
      • STEM school (2016 – 2017)
    • Abdus Salam Memorial Lecture Series
  • Facilities
    • Laboratories
    • Equipments
    • Devices & Softwares
      • PhysPlot
      • Physlogger
      • Phystrack
    • Mechanical Workshop
    • Inventory
    • 3D Printed Galleria
    • Forms
    • Equipment Howto’s
  • PhysGPT
  • Contact Us

Imaging Electron Trajectories: e/m Measurement with a Magic Eye and ImageJ

Home \ experiment
Student Manual

A magic eye is a simplistic triode tube that was used as a tuning indicator in radio receivers around the time of the World-War II. It has a bowl shaped anode coated with a phosphorescent material that produces a green glow when electrons strike on it. In this experiment, we measure the radius of curvature of the path of electrons in a magnetic field using a freeware, open-source image processor ImageJ, and calculate the charge-to-mass ratio of the electron.

Software Code ImageJ
Sample Results Image processing in ImageJ
A graph for finding the e/m ratio
Experiment Code 1.15
Version 28 October 2015, 2015-v1

Further Readings and References

  • imageJ_Link
    ImageJ, U. S. National Institutes of Health, Bethesda, Maryland, USA, W.S. Rasband, (1997-2012).
  • Error Analysis
    An Introduction to Error Analysis, University Science Books, John R. Taylor, Ch. 8, (1997).
  • Quantum Physics
    Exploring Quantum Physics through Hands-on Projects, John Wiley, Inc., D. Prutchi, and S. Prutch, 77, (2003).

Pictorial Procedure

1. Make sure you have the needed apparatus

1. Make sure you have the needed apparatus

2. Make connections to the tube. The numbering on the white base will help. Consult manual for description of pins.

2. Make connections to the tube. The numbering on the white base will help. Consult manual for description of pins.

3. Set the magic eye filament and the field coil voltage.

3. Set the magic eye filament and the field coil voltage.

4. Set a value on the high voltage DC supply.

4. Set a value on the high voltage DC supply.

 

 

 

 

 

 

 

 

5. Measure the magnetic field inside the coil using a Gauss-meter and its axial probe.

5. Measure the magnetic field inside the coil using a Gauss-meter and its axial probe.

6. Take photographs for analysis, for several voltages from the High voltage supply.

6. Take photographs for analysis, for several voltages from the High voltage supply.

Lab 1 | Tags: atomic
Previous

Verification of de Broglie's hypothesis by Electron Diffraction from Graphite

Next

Energy Conservation in Two Dimensions

PhysLab

Preparing an institutional and national platform for student-driven experimental research in physics.

CONTACT US

Email: [email protected] Telephone: 111-11-LUMS (5867) Address: Lahore University of Management Sciences (LUMS), Sector U, DHA, Lahore Cantt. 54792, Pakistan
TOP
© 2007-2024 PhysLAB, Lahore University of Management Sciences - All Rights Reserved.
  • Home
  • About Us
    • Overview
    • Centre for Experimental Physics Education (CEPE)
    • Physlab Team
    • Physlab Guidebook
    • Alumni
    • Open Positions
    • Muhammad Sabieh Anwar (Personal)
  • Academics
    • Lab Courses
    • Lab-I (ENGG-100/PHY-100/200)
    • Lab-II (PHY 300/500)
    • AstroLAB
    • Ibn Sahl Corner for Optics
    • Fast Optics
    • Smart Physics
    • Single Photon Quantum Mechanics Lab
    • Chasing Cosmic Ray Muons at Physlab
    • Stories
    • Physics Studio
    • Research Stories
    • Class Activities
    • Courses Taught
    • Class Demonstrations
    • PhysDiary
    • Health and Safety
    • Lab Safety
    • Workplace Organization
  • Research
    • Research Themes
    • Research Internships
    • Research Stories
    • Physics WorldCup
      • International Young Physicists’ Tournament (IYPT) 2019
      • International Young Physicists’ Tournament (IYPT) 2018
      • International Young Physicists’ Tournament (IYPT) 2016
    • Hunerkada
    • Grants
    • Theses and Reports
    • Scientific Publications
    • Invited Talks (Selected)
  • Outreach
    • Media
      • Lectures, Podcasts and Interviews
      • Videobytes
      • YouTube Channel
      • Visitors
      • Testimonials
    • The Scientific Mind Through the Eyes of a Physics Experimenter
    • National Laboratory Immersion Program
      • First Lahore 2012
      • Second Sukkur 2013
      • Third Lahore 2014
      • Fourth Lahore 2016
    • Labview Workshop 2016
    • Open house
      • 2009-2015
      • Open house 2023
    • Khwarizmi Science Society
    • Helping Pakistan’s Universities
      • National University of Technology (NUTECH) 2019
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Final Phase)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2019 (Phase 2)
      • Pakistan Institute of Engineering and Applied Sciences
        (PIEAS) 2018 (Phase 1)
      • National University of Science & Technology 2016
      • Habib University 2014
      • Preston University 2013
      • Ghulam Ishaque Khan Institute of
        Engineering Sciences and Technology 2011
      • Institute of Space Technology 2010
    • The National STEM School
      • STEM School (2018 – 2019)
      • STEM school (2016 – 2017)
    • Abdus Salam Memorial Lecture Series
  • Facilities
    • Laboratories
    • Equipments
    • Devices & Softwares
      • PhysPlot
      • Physlogger
      • Phystrack
    • Mechanical Workshop
    • Inventory
    • 3D Printed Galleria
    • Forms
    • Equipment Howto’s
  • PhysGPT
  • Contact Us