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Physics 145 Introduction to Experimental Physics I Instructor: Karine Chesnel

Physics 145 Introduction to Experimental Physics I Instructor: Karine Chesnel Office: N319 ESC Tel: 801- 422-5687 kchesnel@byu.edu Office hours: on appointment Class website: http://www.physics.byu.edu/faculty/chesnel/physics145.aspx. Lab space availability.

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Physics 145 Introduction to Experimental Physics I Instructor: Karine Chesnel

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  1. Physics 145 Introduction to Experimental Physics I Instructor: KarineChesnel Office: N319 ESC Tel: 801- 422-5687 kchesnel@byu.edu Office hours: on appointment Class website: http://www.physics.byu.edu/faculty/chesnel/physics145.aspx

  2. Lab space availability Wednesday 3 – 6 pm: 3 seats Thursday 8 – 11 am: 1 seat Thursday 11 am– 2 pm: 1 seat Thursday 3 – 6 pm: - Friday 11am – 2 pm: 9 seats Friday 2 – 5 pm: -

  3. Your lab assignments Prepare by reading the introduction material Answer quiz questions (within the first half hour) and submit the sheet to your TA Proceed to the experiments: L2.1, L2.2, etc… Write a report of your findings for each experiment, in your lab notebook (individual reports)

  4. Grades Lab report (20 pts) • Reading quizzes: 5 pts • Experiment, Data, observation: 10 pts • Discussion / Conclusion: 3 pts • Participation: 2 pts Final Test: 20 pts

  5. Lab 2 Spectroscopy

  6. Lab 2: spectroscopy Prism Dispersion of visible light into a spectrum Rainbow Dispersion of sunlight by raindrops in sky

  7. Lab 2: spectroscopy

  8. Lab 2: spectroscopy Speed of light period wavelength (cyclic wavenumber) wavenumber Energy momentum Planck’s constant

  9. B. Calibration • L2.2: Acquire spectrum of He gas lamp • L2.3: Identify lines and calibrate (convert pixels into wavelength numbers) • L2.4: Check new spectrum Lab 2: spectroscopy A. Qualitative observations • L2. 1: Hand-held spectroscope

  10. Lab 2: spectroscopy Helium emission spectrum

  11. D. Incandescent lamp • L2.9: Acquire spectrum of incandescent light bulb • L2.10: Compare to black body spectrum and estimate the temperature of the bulb E. Fluorescent lamp • L2.11: Acquire spectrum of fluorescent lighting panel • L2.12: Compare to spectrum to literature • L2.13: Extrapolate spectrum to black-body emission • L2.14: Acquire spectrum of LED (flashlight) Lab 2: spectroscopy C. Hydrogen emission • L2.5: Acquire spectrum of H2 gas spectrum • L2.6: Identify 4 Balmer- visible lines • L2.7: compare with literature • L2.8: retrieve the quantum numbers ni

  12. E 0 E4 E3 Energy transition Paschen E2 Balmer E1 Rydberg constant Lyman Lab 2: spectroscopy Hydrogen emission spectrum Balmer visible series

  13. Lab 2: spectroscopy

  14. Wien displacement law Analogy: lava emits light when hot ! Quantum statistical mechanics Black-body spectrum Bosons at equili- brium T

  15. Lab 2: spectroscopy Fluorescent lamp

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