Wednesday, 4-28-10
  • In Class:
    • Rvw Young's Double Slit.
    • Discuss Diffraction Gratings.
    • Do diffraction grating lab. Find d for diffraction gratings.
  • Homework:
    • PS Interference:
      • Ch 14: #30, 31
      • Ch 24: #1, 3, 35, 37

Tuesday, 4-27-10:
  • In Class:
    • Review waves. Waves: reflect; refract; interfere; diffract
    • reflect: theta i = theta r
    • refract: n=c/lamba; n1sina=n2sinb; n=lambda vacuum / lambda medium;
    • Interfere: depends on phase where waves are detected (by your eyes, ears, or some computer-based sensor).
    • Diffract: waves bend around barriers
  • Homework:
    • Be ready for two point source interference.
    • Study two point source sound interference
    • Study two point source light interference.
    • Book: Sound = Ch 14.7; Light = 24.1 - 24.2
    • PS Interference:
      • Ch 14: #30, 31
      • Ch 24: #1, 3, 35, 37
    • We will plot data in a y=mx+b form

Wednesday, 4-21-10:

Tuesday, 4-20-10:
  • In Class:
    • Do Waves slinky lab
    • Discuss:
      • pulse
      • interference (or superposition)
      • constructive & destructive
      • Standing Waves
      • Fundamental Frequency
      • Harmonics & Overtones
      • Speed of a Wave depends on the MEDIUM through which the wave travels.
  • Homework:
    • Read Ch13.7 --> 13.11
      • Note: the material in sections 13.1 & 13.2 we've covered.
        • Recall: Simple Harmonic Motion (SHM) or Simple Harmonic Oscillations (SHO) is when BOTH 1) an object moves about an equilibrium position and 2) the force pushing the object back towards the equilibrium is proportional to the objects displacement from equilibrium. This means the F to push it back to equilibrium gets bigger the farther the object is from equilibrium and smaller as the object approches equilibrium. Think about a bungee cord with our bungee jumping stuff.
      • the material in sections 13.3 - 13.5 is fair game for the ap test.
    • Do Knight Packet #1, 7, 9, 18-20
      • note phase shift f back is simply the starting point of the oscillation. if the phase shift f is 0 (zero) then you start at equilibrium. if the phase shift f is pi, then you start over at pi. it just shifts where your starting amplitude should be.

Tuesday, 4-13-10:
Jump to SHM & Waves section (link on the left).

Monday, 4-12-10:
  • In Class:
    • Rvw Snell's Law lab.
      • If n < 1, you did not create the correct plot. You will have to adjust the analysis.
    • Rvw HW
      • Should have mirror packet turned in.
      • Should be done w/ PS Optics 1
      • Should be done w/ PS 22.1
    • Note that frequency does NOT change when the medium changes.
  • Homework:
    • Read 23.6 (do not need eqn 23.12)
    • Use Mullins packet of optics notes handed out before spring break. The information on drawing ray diagrams for lenses is helpful. Might be better than the textbook.
    • Do lens packet (handed out today).
    • Lens packet:
  • Notes from class today:

Friday, 4-09-10:
  • In Class:
    • Work on Snell's law lab
      • Enter data into excel for snell's law lab
      • plot x y scatter plot, insert line of best fit, display equation and R^2 value
      • how would you change y-intercept
      • how would you change slope
      • what does y-intercept represent
      • what does slope represent
    • what is the n value for the plastic?
    • how does that compare to the value in your text?
  • Homework:
    • 23.5 & 23.6
      • Begin by reading figures
      • Review the active figure items for these sections on
    • 22.4-22.6
      • Review these sections for conceptual understanding. do not worry about any equations or calculations

Thursday, 4-08-10:
  • In Class
    • collect data for snell's law lab
  • Homework:
    • Bottom of page 730 - pg 736. Read captions to figures. Try the ilrn site to check the active figure 22.6 , 22.7, InterActive Example 22.4
    • Do PS 22.1: Problem #7, 9, 11, 24
Tuesday, 4-06-10:
  • In Class:
  • Rvw
    • v=f(lambda)
    • v=lambda / period
    • f=1/T
    • T=1/f
    • 1/f = 1/di + 1/do
    • M = -di/do = hi/ho
  • slides below are some workings of ray diagrams that were assigned over break.
  • Homework:
    • Read
      • pg 728 & 729
      • 23.1 - 23.3
    • DO Problem Set Optics 1:
      • Ch 23 Prob #5, 6, 9, 11, 13, 17;
      • Ch 21 #50, 51, 52 (note that the speed of a light wave in vacuum or in air is roughly 300,000,000 m/s or 3x10^8 m/s)

Friday, 3-26-10:
  • In Class:
    • Correct exams. You grade someone elses, not your own.
  • Homework:
    • Over Break:
      • Work on optics. You have 3 packets.
        • Packet One contains instructional text (Mullins Optics),
        • Packet Two contains images from your textbook.
        • Packet Three is a question packet
      • You are responsible for learning the sections on mirrors and completing packet 3.
      • Packet One has lessons labeled. For example, the right have of the front sheet has a label,
        • Lesson 4-06 Electromagnetic Spectrum, Reflection and Index of Refraction"
          • Within this section, right now, focus on Law of Reflection.
        • Lesson 4-07 Skip this section for now. We will come back to it.
        • Lesson 4-08 ALL of this is required over spring break.
        • Lesson 4-09 Skip this section for now. We will come back to it.
      • Packet Three.
        • Do ALL questions on this packet.
        • Learn how to draw two rays for ANY circumstance. Use those two rays exclusively.
        • Many places state that you should learn 3 rays. The 3rd ray is a double check of the first 2. Learn 2 rays perfectly. Use them perfectly. Then you don't need the 3rd and you save some time.
      • Sample ray diagrams online:

  • In Class:
    • Review Test
  • Homework:
    • Read 22.1 - 22.2:
    • The topics in 22.2 will be heavily used over the next few weeks..
    • Notes on Energy, ray approximation, reflection, refraction.

Thursday, 3-26-09:
  • In Class:
    • Discuss light, photons, energy, snells law, puke.
    • Begin Snell's Law Lab:
    • Determine how to graphically find the index of refraction of a piece of plastic. Use multiple initial angles. Record angles of incidence and refraction.
  • Homework:
    • Have a procedure outlined for the Snell's Law Lab.
    • Read 22.3
    • PS 22.1: Prob#8, 9, 10, 13
      • note #9: when they state lambda = 632.8 nm, they mean that is the wavelength in air. The wavelength and speed will be different in the corn syrup.
  • Note: Good YouTube Video: <>
    • Extra Credit to Whomever downloads this YouTube video and posts the video on this site so we don't require a link to YouTube. Easy enough. I'm just farther behind than normal... Even for me.
  • Note: Another Video. Not a funny YouTube video,but this one is pretty interesting. Guy used physics and optics to determine the date of origin of some paintings. Looks at optics in movies too. Pretty good information.

Monday, 3-30-09:
  • Get Homework done For Tuesday and you get your choice of 10pts extra credit for quarter 4 or quarter 3 (your choice).
  • In Class:
    • Finish Snell's Law Lab
  • Homework:
    • Read 23.4, 23.6 (do not worry about eq 23.12)
    • Note that the ray diagrams in sections 23.4 - 23.6 are not terribly accurate (the rays only change direction in the middle of the mirror). The ray diagrams in 23.7 are a bit closer.
    • Pay careful attention to the signs of do, di, f (or p, q, f).
    • Look for a definition of real, virtual, upright, and inverted images.
    • Create a table and record when do, di, f, M are +, -, 0, infinity for a lens.
    • PS 23.1:
      • Prob:#27, 29
Tuesday, 3-31-09:
  • In Class:
    • Discuss Snell's law, converging lenses, diverging lenses, 1/do + 1/di = 1/f; f=0.5r, Magnification
    • Do Lens Lab: (information in the pdf below).
    • Use house across the street as object. Object distance REALLY BIG compared to focal length. Find focal length of lens.
    • Some notes are here:APPB 3-31-09.pdf
  • Homework:
    • Finish HW from Monday.
    • Read pg 771 - 773 regarding ray diagrams.
    • Pick up packets
    • In the Notes packet:
      • Read:
        • First the right side of page 1
        • back of 1st page
        • Skip to the last two pages. Read the sections after: "Lesson 4-9: Image Formation with Thin Lens."
    • In the Lens Ray Diagram packet:
      • Complete Ray Diagrams for each sheet under the following steps:
        • Choose which ray to draw first: Draw that ray for EACH lens in the packet.
        • Move to the 2nd ray type. Draw that ray for each lens.
        • Continue until you've drawn each ray.

Wednesday -> Friday before break & Spring Break Material:

NOTE: Goals for Spring Break:
  • Be competent with ray diagrams and calculations for lenses & mirrors.
  • Understand wave reflection from a fixed boundary, reflection from a flexible boundary, superposition principle (wave interference) conditions for a standing waves, doppler effect (qualitative, no numbers).
  • Finish Lens & Mirror packets that require sketching ray diagrams for lenses & mirrors (duh).
  • Read Review & Study 3 Packets: 1 packet on Waves, 1 packet on Geometric Optics, 1 Packet from Wayne Mullins.

Additional Waves & Optics Simulations:

Monday, 4-13-09:
  • In Class:
    • Discuss Adopt-A-Physicist
    • Discuss time-line for rest of year & material to cover.
    • Lenses, Mirrors, f=- somtimes. Do you know when?
  • Homework:
    • Review the waves on a string simulations

Tuesday, 4-14-09:
  • In Class:
    • Discuss Springs & Pendulums
      • Observe f, A, lambda.
      • Discuss SHM.
    • Do Waves on a Spring lab:
      • Use transverse waves on a spring to analyze:
      • pulse & wave reflections
      • pulse & wave interference (or superposition)
      • fundamental frequencies
      • Note: We used transverse waves on a spring, but these results CAN be generalized to other transverse waves AND longitudinal waves.
  • Homework:
    • Knight 14 Oscillations: #5, 7, 8, 10a, 17, 20, 21, 22, 23

    • Use Mullins Packet to review harmonic oscillators (SHM)
    • Use Spring Break Waves packet to review pulses & superposition..
    • From your Text:
      • SHM, Springs & Pendula Chapter 13:
        • 13.1 Hooke's Law (did this with car & bungee jumping lab)
        • 13.2 elastic potential energy (did this w/ bungee jumping lab)
        • 13.3 Comparing SHM w/ uniform circular motion (know period / frequency equation)
        • 13.4 x,v,a as fct of time (not a huge deal. some mc questions)
        • 13.5 motion of pendulum (know period / frequency equation)
        • 13.6 Damped Oscillators (interesting, but skip it)
        • 13.7 Waves (good stuff)
        • 13.8 f, a, lambda: basic definitions. MUST KNOW (& might already)
        • 13.9 Speed of Waves on a String (gotta check- been 1 question in the past 2 decades, topic might be removed)
        • 13.10 Interference of Waves (IMPORTANT)
        • 13.11 Reflection of Waves (IMPORTANT)
      • Sound Chapter 14:
        • 14.1 - 14.3 do not focus on these.
        • 14.6 Doppler Effect (conceptual approach only)
        • 14.7 Interference of Sound Waves (Required. works exact same w/ light. We'll demo sound, do light lab)
        • 14.8 Standing Waves (was in waves packet. Waves in Springs lab on 4-14-09 should help round this off)
        • 14.9 Forced vibration & Resonance (in class discussion should do it)
        • 14.10 Standing Waves in Air Columns (in spring break packet & class demo. goes with standing waves in waves in springs lab)
        • 14.11 Beats (easy. 2 minutes in class might take care of a random mc question)
        • 14.12 Quality of Sound (quick class discusion)
        • 14.13 Ear (biology... who needs it?)
      • Reflection & Refraction of Light Chapter 22:
        • 22.1:

Thursday, 4-16-09:
  • In Class:
    • Finish waves on a spring lab.
    • Quickly discuss 'phase constant'. It is basically how many radians is the sine wave away from being a sine wave. If the sine wave looks like a cosine wave, then it is off by pi/2.
    • Interference discussion included:
      • constructive vs destructive Interference (also called superposition principle).
      • works for mechanical waves (like sound, water waves, earthquake tremors, waves where a physical thing oscilates).
      • works for electromagnetic waves (visible light (roygbiv), radio waves, ultra-violet waves, infra-red, tv waves, x-rays...)
      • for coherent (same frequency) waves, you should get a different intensity for the interference pattern.
    • Used PhET sound simluation with 2 point sources to demo on pc. Then tried it with 2 speakers. Find wavelength by finding loud / quiet spots. Can do this same thing using light. With light it's called Young's Double Slit lab. We'll do this on Friday.
  • Homework:
    • If you go to: then select our school (only one in mn) and enter our pin (2574) ask some folks some questions.
    • Good questions might earn you extra credit. I say might because there are a couple of conditions and a timeline:
      • 1- the question should be good, not, "do you prefer chocolate or butterscotch?"
      • 2- you have to write down that you asked a good question for adoptaphysicist and put that in the homework box.
      • 3- you need to be patient enough for me to go through all of the in-box stuff and enter the extra credit stuff (it Does happen when they are written down).
    • Knight 21 Superposition Packet #'s: 3, 9, 11a-c, 12a-c, 13, 15
    • If you have a laser pen or other laser, bring it in for lab on friday & monday. we'll use 'em for our Young's Double Slit lab.

Monday, 4-20-09:
  • In Class:
    • Review two point source interference.
    • Begin Young's Double Slit Interference Lab.
  • Homework:
    • Be prepared to collect data and graphically find the wavelength of the light-source. On Tuesday you should be able to [collect data, enter it into Excel, get a graph, analyze the equation for the line of best-fit,] to find the wavelength.
    • Read Ch 14.7 (pg 473) and Ch 24.2 (pg 787).
    • Take notes on the two versions of two-pt source interference.
    • PS Interference 1: Ch14 prob 31; Ch 24 #1, 3, 7
  • Note: There is a Review section for you in the left navigation menu.

Thursday, 4-23-09:
  • Morning Review Session:
    • Static Fluids. (notes included in stuff below).
    • Note there is a review link in our Navigation Menu to the left.
  • In Class:
    • Rvw Superposition ws.
    • Discuss Thin Film Interference.
    • Handout Hewitt Conceptual Physics approach to double slit interference and thin film interference.
    • Board work:
  • Homework:
    • Review your text information on Thin Film Interference (24.4)
    • Recall that we said the interference must include effects from:
      • reflections on both surfaces
      • path length of wave inside the thin film media.
    • Recall that we said the equation must use the wavelength of the ray while INSIDE the thin film.
    • NOTE: The equation in your book for thing film interference INCLUDES the conversion from wavelength in air to wavelength in the new medium.
    • PS 24. TFI: Ch 24 #15, 17, 18, 19, 23
    • Note: I know this is a lot. Set the problems up. determine conditions for reflections and conditions for path length. SKETCH the situation. You might find the equations in your book helpful. Be sure you check your equation sheet. Be aware of the comparison of equations stated on that sheet in comparison to the equations in your book.

Monday, 4-27-09:
  • In Class:
    • Discuss review sessions
    • Discuss Friday afternoon meeting at Hamline
    • Review 2 pt source interference
    • Review thin film interference
    • Discuss Diffraction Gratings
  • Homework:
    • PS: 24.n: Ch 24 # 39; Ch 21 #50, 51; Using E=hf, find energy for each frequency of light in the Ch 21 probs.

Tuesday, March 25, 2008
In Class:
  • Finish up Young's Double Slit Lab
  • Finish/Turn in homework
  • Discuss what next two months entails
  • I don't remember what the homework was or if there was any for tomorrow. Any posts would be greatly appreciated. -Rosenberg


Wednesday, 3-26-08:
Thursday, 3-27-08:
  • In Class:
    • Review Thin Film Interference.
    • Discuss Diffraction Gratings
    • Discuss Snell's Law
  • Homework:
    • Read the sections on Diffraction gratings & Snell's Law
    • Do Ch 24 # 39.
    • Be ready for Snell's Law lab on Friday. You will collect angle of incidence and angle of reFRACTion data. How will you plot these data to find the index of refraction of the plastic piece? If you plot data as an x vs y scatter plot, the index of refraction would probably end up being either a slope value, or a y-intercept value. Try to figure what you would plot where, and what value of the best fit line would be used to find the index of refraction.
Friday, 3-28-08:
  • In Class:
  • Homework:
    • work on lab
    • review lenses. KNOW how to draw 2 rays for any lens type.
    • remember that over break you were assigned packets that covered chapter 22. That is where Snell's Law and some other optics basics are covered. Chapter 23.4 --> 23.6 cover lens basics. Read them and be ready for more on Monday.\
Monday, 3-31-08:
  • In Class:
    • Finish Snell's Law Lab (finish collecting data, plotting graph, & determining the index of refraction).
    • Discuss photon wavicle absorption & re-emission
  • Homework:
    • Review materials on lenses & mirrors:
    • When is f (+) for mirrors
    • When is f (-) for mirrors
    • When is r (+) for mirrors
    • When is r (-) for mirrors
    • When is f (+) for lenses
    • When is f (-) for lenses
    • When is r (+) for lenses
    • When is r (-) for lenses
    • Try to learn 2 rays that you can draw for any mirror.
    • Try to learn 2 rays that you can draw for any lens.
  • Note: Test Thursday

Tuesday, 4-01-08:
  • In Class:
  • Homework:
    • Do Mirror Probs Ch 23 # 5, 7, 8, 11, 17
    • Do Lens Probs Ch 23 # 29, 31, 35
  • Future:
    • Tomorrow: Check 1 maybe 2 of the hw probs. Do 1 lens/mirror prob. try an AP question
    • Test Thursday.
Thursday, April 3, 2008
In Class:
  • Take test
  • do take-home test for Friday.