"Beauty isn't worth thinking about; what's important is your mind. You don't want a 50-dollar haircut on a 50-cent head."
--Garrison Keillor
Preparation
Pre-lab assignment 6 (*.html)
(Due 12:00 PM before start of lab)
Equipment
rulers/metersticks (12", 1 m, 2 m)
whiteboards, markers
laser, AC supply
adjustable jack platforms (2)
scotch/masking tape, binder clips (to mount hair strands)
Research Question
When a laser beam shines on hair, there will be diffraction minima on either side of the central diffraction spot. The location of the diffraction minima (the width of the central diffraction spot) depends on the thickness of the hair right at where the laser beam shines. For each of your group members, how does the thickness of a strand of hair change along its length, starting from the root to its tip?
Tasks
- Procedure
Write a step-by-step procedure on a whiteboard. Instructor will check it off for full credit before data collection. (It is okay to do some preliminary scratch work.) Procedure should be detailed enough for another Physics 205B student to reproduce your results, without having to "fill in the blanks." Instructor may instead make suggestions or corrections that need to be completed before your group can receive full credit.
- Data
Record your data on another whiteboard. Instructor will check it off for full credit before laboratory ends. Data should be detailed enough for another Physics 205B student to understand what relevant quantities were measured for interpretation later. Graphs may be plotted by hand on graph paper, or printed out from a computer.
Make sure you have a copy (hand-written, smartphone photo, etc.) of your instructor-checked procedure and instructor-checked data before cleaning up equipment and leaving laboratory today.
Report Format
- Procedure
- Data
- Discussion/Conclusion
Describe how the data is used to answer the research question. Discussion should be detailed enough for another Physics 205B student to reproduce your results, given similar data.
Your report should include all three parts, manuscript format (double-spaced neat writing or typed; equations/calculations can be written in by hand). Due at the end of next laboratory. (Reports up to one week late are graded for half-credit. No reports accepted more than one week late.) Additional credit awarded for instructor verifiably receiving report during the first 10 minutes of next laboratory.
Preparation/Reflection Points
1 = Pre-lab reading assignment (graded for completion)
1 = Post-lab reflection assignment (graded for completion)
Report Points (due at end of next lab, +1 bonus for early submission)
1 = Procedure (graded for completion during lab)
1 = Data (graded for completion during lab)
3 = Discussion/Conclusion/Report
3 = Complete, thorough, understandable
(Reproducible by another student from start-to-finish.)
2 = Minor, "resolvable" omissions--acceptable effort
(Some common-sense/intuitive steps missing.)
(Another student would need a few minutes in order to "fill in the blanks.")
1 = Major "problematic" omissions--minimally acceptable effort
(Some essential/critical steps missing.)
(Another student would need to ask questions in order to "fill in the blanks.")
0 = Unacceptable or no significant effort beyond original in-lab work
1 = Early bonus for report received by instructor up until first 10 minutes of next lab
Follow-up
Complete this week's lab report and post-lab assignment, next week's pre-lab assignment, and review lab instructions.
Due 12:00 PM before start of next lab
Post-lab assignment 6 (*.html)
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