Physics 145 Introduction to Experimental Physics I Instructor: Karine Chesnel Office: N319 ESC Tel: 801- 422-5687 Office hours: on appointment.

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Presentation transcript:

Physics 145 Introduction to Experimental Physics I Instructor: Karine Chesnel Office: N319 ESC Tel: Office hours: on appointment Class website:

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: -

Your lab assignments 1.Prepare by reading the introduction material 2.Answer quiz questions (within the first half hour) and submit the sheet to your TA 3.Proceed to the experiments: L2.1, L2.2, etc… 4.Write a report of your findings for each experiment, in your lab notebook (individual reports)

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

Lab 2 Spectroscopy

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

Lab 2: spectroscopy

wavelength Speed of light period wavenumber (cyclic wavenumber) Energymomentum Planck’s constant

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

Lab 2: spectroscopy Helium emission spectrum

C. Hydrogen emission L2.5: Acquire spectrum of H 2 gas spectrum L2.6: Identify 4 Balmer- visible lines L2.7: compare with literature L2.8: retrieve the quantum numbers n i 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

Hydrogen emission spectrum Balmer visible series Energy transition Rydberg constant E 0 E1E1 E2E2 E3E3 E4E4 Lyman Balmer Paschen

Lab 2: spectroscopy

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

Lab 2: spectroscopy Fluorescent lamp