Collected Saving Jack Labs.
Only 10 of 18 students present.
Students solved wave and standing wave problems.
Summarized properties of waves: reflection, refraction (Snell's Law, index of refraction, critical angle)
Started diffraction - Young's Two Slit example. The closer the slits, the farther apart the maxima.
Monday, March 31, 2008
Friday, March 21, 2008
Friday, March 21, 2008
Lab Day for Waves
Demonstrated Belly-Dancing Tuning Forks.
Set up Dave Cross Wave Machine. Students were asked to determine how the wave speed depends on the number of nodes and the tension in the string.
Set up resonance tube with water. Students were asked to calculate the resonant depths and then verify by experiment.
Snell's Law Lab. Students were asked to measure the index of refraction of water and calculate the speed of light in water.
Reviewed results for the last 20 minutes of class.
Demonstrated Belly-Dancing Tuning Forks.
Set up Dave Cross Wave Machine. Students were asked to determine how the wave speed depends on the number of nodes and the tension in the string.
Set up resonance tube with water. Students were asked to calculate the resonant depths and then verify by experiment.
Snell's Law Lab. Students were asked to measure the index of refraction of water and calculate the speed of light in water.
Reviewed results for the last 20 minutes of class.
Thursday, March 20, 2008
Thursday, March 20, 2008
Gave students 30 minutes to finish up their "Save Jack" Labs.
Handed back RA 18.1, RA 18.2
Went over work sheets
Showed examples of superposition. Propagate waves than just algebraically add up the waveforms.
Electromagnetic spectrum: Radio waves, microwaves, infrared, Visible (R-O-Y-G-B-I-V), Ultraviolet, X-rays, gamma rays. Used v = wavelength * freq to calculate the wavelengths of AM and FM radio waves. Wavelength of microwave from microwave oven.
Used Wien's Law to calculate wavelength emitted by our bodies (infrared). Red wavelengths ~700 nm. Violet ~ 400 nm.
Demo that TV emits radio waves that we can pick up on radio set to static AM.
Discussed how microwaves cook food - resonant frequency with water molecules.
Showed how remotes, which emit IR, can be detected using a photocell and speaker, or by cell phone camera.
Standing waves: String fixed at both ends. v = sqrt(tension/(mass/length)).
Drew patterns of fundamental (first harmonic), and second and third harmonics for string, open pipe, and pipe open at one end and closed at the other. Derived general formulas for frequency for the various harmonics.
Used water filled pipe to find resonances.
Handed out worksheets on superposition and standing waves.
Handed back RA 18.1, RA 18.2
Went over work sheets
Showed examples of superposition. Propagate waves than just algebraically add up the waveforms.
Electromagnetic spectrum: Radio waves, microwaves, infrared, Visible (R-O-Y-G-B-I-V), Ultraviolet, X-rays, gamma rays. Used v = wavelength * freq to calculate the wavelengths of AM and FM radio waves. Wavelength of microwave from microwave oven.
Used Wien's Law to calculate wavelength emitted by our bodies (infrared). Red wavelengths ~700 nm. Violet ~ 400 nm.
Demo that TV emits radio waves that we can pick up on radio set to static AM.
Discussed how microwaves cook food - resonant frequency with water molecules.
Showed how remotes, which emit IR, can be detected using a photocell and speaker, or by cell phone camera.
Standing waves: String fixed at both ends. v = sqrt(tension/(mass/length)).
Drew patterns of fundamental (first harmonic), and second and third harmonics for string, open pipe, and pipe open at one end and closed at the other. Derived general formulas for frequency for the various harmonics.
Used water filled pipe to find resonances.
Handed out worksheets on superposition and standing waves.
Wednesday, March 19, 2008
Tuesday, March 18, 2008
Tuesday, March 18, 2008
Lab Day
Students did the:
Speed of Sound in Air Lab
Tones, Vowels, and Telephones Lab (didn't finish)
Speed of Sound in Aluminum Lab
Asked for write-ups that were terse and pithy covering the main idea and results.
Tomorrow we do the "Save Jack" lab
Students did the:
Speed of Sound in Air Lab
Tones, Vowels, and Telephones Lab (didn't finish)
Speed of Sound in Aluminum Lab
Asked for write-ups that were terse and pithy covering the main idea and results.
Tomorrow we do the "Save Jack" lab
Monday, March 17, 2008
Monday, March 17, 2008
Went over Thermodynamics test.
Intro lecture on waves. A wave is a wiggle in space and time.
A wave is a way of transferring energy without the movement of matter from one place to another.
Waves can be classified as transverse or longitudinal, or mechanical or electromagnetic. Went over properties of each.
Derived wave speed formula.
Students did the Slinky Lab
Homework: Plan for Save Jack Lab on Wed.
Intro lecture on waves. A wave is a wiggle in space and time.
A wave is a way of transferring energy without the movement of matter from one place to another.
Waves can be classified as transverse or longitudinal, or mechanical or electromagnetic. Went over properties of each.
Derived wave speed formula.
Students did the Slinky Lab
Homework: Plan for Save Jack Lab on Wed.
Thursday, March 13, 2008
Wednesday, March 12, 2008
Went over RA 17.2.
Lectured on the Second Law of Thermodynamics.
Explained the various statements of the Second Law.
Defined entropy. Showed how to calculate the change in entropy.
Gave students a practice test on Thermodynamics which they worked on in groups.
Handed out RA 18.1 and RA 18.2 for homework over the long weekend.
Lectured on the Second Law of Thermodynamics.
Explained the various statements of the Second Law.
Defined entropy. Showed how to calculate the change in entropy.
Gave students a practice test on Thermodynamics which they worked on in groups.
Handed out RA 18.1 and RA 18.2 for homework over the long weekend.
Tuesday, March 11, 2008
Tuesday, March 11, 2008
Went over RA 17.2
Showed how to draw schematics of thermodynamic systems.
Went over First Law of Thermo sign convention worksheet.
Did problem of heat engine with ideal gas as a class.
Handed out "Save Jack" problem for IB Lab (Planning (A), Planning (B), Data Collection, Data Analysis, Conclusions. Watched part of Titanic to get "feel" and background for the problem. Plan on doing lab next week.
Showed how to draw schematics of thermodynamic systems.
Went over First Law of Thermo sign convention worksheet.
Did problem of heat engine with ideal gas as a class.
Handed out "Save Jack" problem for IB Lab (Planning (A), Planning (B), Data Collection, Data Analysis, Conclusions. Watched part of Titanic to get "feel" and background for the problem. Plan on doing lab next week.
Monday, March 10, 2008
Monday, March 10, 2008
Went over Heat test.
Went over RA 17.1 with emphasis on the sign convention for the first law of thermodynamics.
HW: RA 17.2, First Law sign convention worksheet.
Went over RA 17.1 with emphasis on the sign convention for the first law of thermodynamics.
HW: RA 17.2, First Law sign convention worksheet.
Friday, March 7, 2008
Friday, March 7, 2008
Test on Heat and Temperature
Handed out RA 17.1 due Monday
There is a WebAssign assignment but I think I forgot to mention it.
Handed out RA 17.1 due Monday
There is a WebAssign assignment but I think I forgot to mention it.
Thursday, March 6, 2008
Thursday, Mar 6, 2008
Review for Test.
Asked questions around the room.
Went over Thermal Concepts problems.
Test tomorrow.
Asked questions around the room.
Went over Thermal Concepts problems.
Test tomorrow.
Wednesday, March 5, 2008
Wednesday, March 5, 2008
Handed out Kinetic Theory Worksheets.
Travis ran the class going over the worksheet. Great Job Travis!
Tomorrow we will go over any questions from Thermal Problems worksheet and the summary review sheet.
Friday: Test on Heat
Travis ran the class going over the worksheet. Great Job Travis!
Tomorrow we will go over any questions from Thermal Problems worksheet and the summary review sheet.
Friday: Test on Heat
Tuesday, March 4, 2008
Tuesday, March 4, 2008
Answered questions and talked briefly about the Newton's Cooling Lab. Students will answer the analysis questions, being sure to say in their answers what they are answering, by Friday.
Handed back Heat Capacity Labs
Students spent the period working on the Thermal Problems Worksheet.
Test on Friday
Handed back Heat Capacity Labs
Students spent the period working on the Thermal Problems Worksheet.
Test on Friday
Monday, March 3, 2008
Monday, March 3, 2008
Students set up for Newton's Cooling Lab.
While running, I reviewed the Heat Capacity Lab with emphasis on controlling variables, especially heat loss.
When students write up the Power from the Sun Lab, I want to see at least 5 main points in reviewing the procedure and 5 main points in modifying or improving the procedure. This lab will be written up to satisfy the data collection, data processing, and conclusions sections of an IB lab.
Students analyzed Newton's Cooling curves using the automatic curve fit function. Students looked at the coefficients for the fit curve. If they were not reasonable, students entered in the Room Temperature and rechecked the coefficients. Students got reasonable results with this correction.
Students wrote up questions 1-9 in the lab analysis section. If they did not finish, finish for homework.
While running, I reviewed the Heat Capacity Lab with emphasis on controlling variables, especially heat loss.
When students write up the Power from the Sun Lab, I want to see at least 5 main points in reviewing the procedure and 5 main points in modifying or improving the procedure. This lab will be written up to satisfy the data collection, data processing, and conclusions sections of an IB lab.
Students analyzed Newton's Cooling curves using the automatic curve fit function. Students looked at the coefficients for the fit curve. If they were not reasonable, students entered in the Room Temperature and rechecked the coefficients. Students got reasonable results with this correction.
Students wrote up questions 1-9 in the lab analysis section. If they did not finish, finish for homework.
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