# Unit 2 Semester 2 Waves, Intro To Light And Sound

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Waves: Water, Light and sound Sections 12.3,12.4,13.1,14.1,14.2,15.1 and 15.2College physics Semester 2 Unit 2What is a wave? How do they act? How are do waves differ?1/29Pre-test Waves on a StringNotes: Introduction to WavesLab: Waves on a String Activity (PhET)Do: read 12.3 p457 (1,3,5)1/30Clicker questions: Waves on a StringLab: Fourier-Making Waves part 1 (PhET)2/1Lab: Fourier-Making Waves part 2 (PhET)Do: read 12.4 p465 (1-5), p 471 (40,42),2/4Clicker questions: Fourier-Making WavesLab: SoundDo: Worksheet Waves2/5Notes: Wave descriptors, Doppler and demos, clicker questionsLab: Sound wave activity (PhET)Do: read 13.1, p486 (1,3,4,6,7)2/6Clicker questions: Sound wave activityLab: Reflection of lightDo: read 14.1 &14.2 p523 (1,3,5), p551 (16,20)2/8Clicker questions: Sound and wave measurements continuedNotes: light and reflectionDo: read 15.1 p567 (1-3 top of page),2/11Notes: refraction, ray tracing, lens termsLab: Lens propertiesDo: p587 (5,10,11-14), ray tracing problems worksheet2/12Lab: Geometric optics activity (PhET)2/13Notes: Lens problem solving, using Excel for multiple curvesLab: Snell’s law labFull write-up to find the index of refraction for three shapes (one triangle, semicircle incident on curvedside, and the double convex lens) at seven incident angles.Include: 2 summary graphs ( ΘI vs Θr and sinΘI vs sinΘr) with incident information on x-axis with equationsand r2 , calculations for index two ways, raw data sketches, use proper significant digitsDo: read 15.2 p576 (1-4), p579 (1-6) p588 (18,19,20)2/19-2/20 Clicker questions: Reflection, Lenses and RefractionLab: finish Snell’sDo: review p471 (37,38,39,43,44), p507(10,13), p550 (11,12,19,21), 587 (15,16),p588 (31,33,35),2/22ReviewLab: Fourier-Making Waves Game (PhET)2/25TEST2/22/2008 אין לעשות שימוש כלשהו . קובץ זה נועד אך ורק לשימושם האישי של מורי הפיזיקה ולהוראה בכיתותיהם בקובץ זה לכל מטרה אחרת ובכלל זה שימוש מסחרי; פרסום באתר אחר (למעט אתר בית הספר בו . מלמד המורה); העמדה לרשות הציבור או הפצה בדרך אחרת כלשהי של קובץ זה או כל חלק ממנו

Chapter 12-15 Learning Goals: Waves (Light and Sound)Students will be able to:Waves on a String Students will be able to discuss waves’ properties using common vocabulary andthey will be able to predict the behavior of waves through varying medium and atreflective endpointsFourier – Making Waves Part 1 Students will be able to think about waves as a function of time, space or spacetime and explain why waves might be represented in these different ways.Fourier – Making Waves Part 2 Define harmonic, determine the relationship between the harmonics, Explain the relationship between harmonics and the corresponding wave function. Predict what happens when more than one wave is present.Sound and Wave Activity Explain how different sounds are modeled, described, and produced. Design ways to determine the speed, frequency, period and wavelength of a soundwave model.Geometric Optics Activity How an image is formed by a converging lens using ray diagrams How changing the lens effects where the image appears and how it looks Explain the features a lens would need to be used in real applicationsChapter 12: Vibrations and Waves12-3 Properties of Waves Distinguish local particle vibrations from overall wave motionDifferentiate between pulse waves and periodic wavesInterpret waveforms of transverse and longitudinal wavesApply the relationship among wave speed, frequency, and wavelength to solveproblemsRelate energy and amplitude12-4 Wave Interactions Apply the superposition principleDifferentiate between constructive and destructive interferencePredict when a reflected wave will be invertedPredict whether specific traveling waves will produce a standing waveIdentify nodes and antinodes of a standing wave אין לעשות שימוש כלשהו . קובץ זה נועד אך ורק לשימושם האישי של מורי הפיזיקה ולהוראה בכיתותיהם בקובץ זה לכל מטרה אחרת ובכלל זה שימוש מסחרי; פרסום באתר אחר (למעט אתר בית הספר בו . מלמד המורה); העמדה לרשות הציבור או הפצה בדרך אחרת כלשהי של קובץ זה או כל חלק ממנו

Chapter 13: Sound13-1 Sound waves Explain how sound waves are producedRelate frequency to pitchCompare the speed of sound in various mediaRelate plane waves to spherical wavesRecognize the Doppler effect, and determine the direction of a frequency shiftwhen there is relative motion between a source and an observerChapter 14: Light and Reflection14-1 Characteristics of Light Identify the components of the electromagnetic spectrumCalculate the frequency of wavelength of electromagnetic radiationRecognize that light has a finite speedDescribe how the brightness of a light source is affected by distance14-2 Flat Mirrors Distinguish between specular and diffuse reflection of lightApply the law of reflection for flat mirrorsDescribe the nature of images formed by flat mirrorsChapter 15: Refraction15-1 Refraction Recognize situations in which refraction will occurIdentify which direction light will bend when it passes from one medium toanotherSolve problems using Snell’s law15-2 Thin Lenses Use ray diagrams to find the position of an image produced by a converging ordiverging lens, and identify the image as real or virtualSolve problems using the thin-lens equationCalculate the magnification of lenses אין לעשות שימוש כלשהו . קובץ זה נועד אך ורק לשימושם האישי של מורי הפיזיקה ולהוראה בכיתותיהם בקובץ זה לכל מטרה אחרת ובכלל זה שימוש מסחרי; פרסום באתר אחר (למעט אתר בית הספר בו . מלמד המורה); העמדה לרשות הציבור או הפצה בדרך אחרת כלשהי של קובץ זה או כל חלק ממנו

Describe the positioning of lenses in compound microscopes and refracting telescopes קובץ זה נועד אך ורק לשימושם האישי של מורי הפיזיקה ולהוראה בכיתותיהם . אין לעשות שימוש כלשהו בקובץ זה לכל מטרה אחרת ובכלל זה שימוש מסחרי; פרסום באתר אחר (למעט אתר בית הספר בו מלמד המורה); העמדה לרשות הציבור או הפצה בדרך אחרת כלשהי של קובץ זה או כל חלק ממנו .

Lesson plan for Waves on a String90 minutesLearning Goals: Students will be able to discuss wave properties using commonvocabulary and they will be able to predict the behavior of waves through varyingmedium and at reflective endpoints.Background: This activity is inquiry based. The simulation will be used as theintroduction to wave properties and behavior for mechanical waves.Waves on a String Introduction:Define a wave for the students. Our book calls the disturbances in the space-timecontinuum. Demonstrate that the simulation is like a rope on the ground with transversewaves being propagated.Lesson: Have some long ropes or Tygon tubing and perhaps long springs available forstudent investigations. Also have thin paper for tracing the waves off the screens. I used apretest before we started. The student directed portion of the activity took about 40minutes.Standing waves: I made a fair one with the following settings: 20 amplitude 30frequency 0 damping and tension on one tick from rightPost-lesson: I opened Energy Skate Park and showed the Energy-Position and Energytime graphs to help them relate to prior learning. I asked if the graphs represent waves.We discussed why it might be helpful to use the energy-space vs the energy time graphs.We discussed the vocabulary used in the Waves on a String sim throughout this part andduring the clicker questions.There is a nice demonstration sim of Transverse, Longitudinal, and Periodic Waves atNYU. htm The sims are notinteractive, just movies. I did not think that the other movies were worth using becausethe sims demonstrate the ideas better. For superposition and standing waves, use Waveson a String. For Doppler, use Wave Interference and drag the water faucet. Forlongitudinal, use Sound.Then we did the clicker questions.Next we did the Fourier 1 activity.2/22/2008 אין לעשות שימוש כלשהו . קובץ זה נועד אך ורק לשימושם האישי של מורי הפיזיקה ולהוראה בכיתותיהם בקובץ זה לכל מטרה אחרת ובכלל זה שימוש מסחרי; פרסום באתר אחר (למעט אתר בית הספר בו . מלמד המורה); העמדה לרשות הציבור או הפצה בדרך אחרת כלשהי של קובץ זה או כל חלק ממנו

Lesson plan: Fourier-Making Waveshttp://www.phet.colorado.edu 30 minutes and 50 minutesI have divided the learning goals into two activities. There is a game that could be done withoutthese activities.1 Wave Representation Learning Goals:Students will be able to think about waves as a function of time, space or space-time and explain whywaves might be represented in these different ways.2 Superposition of Waves Learning Goals:Students will be able to: Define harmonic, determine the relationship between the harmonics, Explain the relationship between harmonics and the corresponding wave function. Predict what happens when more than one wave is present. I want the students to be able tosuperpose waves to find the sum.Background:We will have added several types of vectors. They do the Waves on a String activity before these activities. We didthe three activities on two 50 minute days and one 90 minute day, along with some lecture and homework review.Fourier-Making Waves Introduction:I didn’t need to show my students anything, but I made a list of some hints to remember. You can change theamplitude by grabbing the bar or typing in a number in the box. As soon as you do, the function changes to custom.Also, show how to set the SUM window on Auto scale. It only auto scales the y axis and reflect axes scales. Whenyou reset, the scale returns to default. The Sum Graph is the observable disturbance.Lesson:The students will need their papers from the Waves on a String activity. Have the students use the lab sheet forguidance.Things I want to remember when I designed the activities:Activity 1:1. When you change function from space to time. There are no changes other than the axis labeland period tool now available rather than wavelength.Activity 2:1. Harmonics have same amplitude but wave lengths that get smaller. To calculate the wavelength ofn harmonic divide the wavelength of the fundamental wave (n 1), by the n of the harmonic. In ourphysics books, the fundamental frequency is given value of n 0 so the equation is not in this form,but I expect this is the form that students will derive. We will have to reconcile with the booksconvention, but I’ll do this later.2. I would want them to see that the SUM window looks like the name and that the individual wavesadd to give that shape, more harmonics make the sum curve smoother. I am not concerned thatthey discover the sum part yet.3. The amplitudes were 1 and .35. The sum looks like this. The x axis labels have changed.2/22/2008 Loeblein אין לעשות שימוש כלשהו . קובץ זה נועד אך ורק לשימושם האישי של מורי הפיזיקה ולהוראה בכיתותיהם בקובץ זה לכל מטרה אחרת ובכלל זה שימוש מסחרי; פרסום באתר אחר (למעט אתר בית הספר בו . מלמד המורה); העמדה לרשות הציבור או הפצה בדרך אחרת כלשהי של קובץ זה או כל חלק ממנו

Lesson plan: Fourier-Making Waves http://www.phet.colorado.edu 30 minutes and 50 minutes 4. The amplitudes were .5 and -.5 for amplitudes. The sum looks like this. 5. The amplitudes were .5 and 1. I had to use Auto scale to see the whole graph. 2/22/2008 Loeblein קובץ זה נועד אך ורק לשימושם האישי של מורי הפיזיקה ולהוראה בכיתותיהם . אין לעשות שימוש כלשהו בקובץ זה לכל מטרה אחרת ובכלל זה שימוש מסחרי; פרסום באתר אחר (למעט אתר בית הספר בו מלמד המורה); העמדה לרשות הציבור או הפצה בדרך אחרת כלשהי של קובץ זה או כל חלק ממנו .

Sound Lab using LabProGet a LabPro and microphone, and then connect to a computer. Setup the Sensor through theExperiment tab if necessary.1. Say “AAAAAAAA” smoothly into the microphone and hit Collect. Once you get a graph that youthink is quality, copy it to a Word document and label it #1. Answer the following questions in yourdocument.a) Would you say this is a periodic wave? Support your answer with characteristics.b) How many waves are shown in this sample? Explain how you determined this number.c) Relate how long the probe collected data to something in your everyday experience. Forexample: “Lunch passes by at a snails pace.” Or “Physics class flies by as fast as a jet bythe window.”d) What is the period of these waves? Explain how you determined the period.e) What is the frequency of these waves? Explain how you determined the frequency.f) Calculate the wavelength assuming the speed of sound to be 340 m/s. Relate the length ofthe sound wave to something in the class room.g) What is the amplitude of these waves? Explain how you determined amplitude.h) What would be different about the graph if the sample were 10 times as long? How

College physics Semester 2 Unit 2 What is a wave? How do they act? How are do waves differ? 1/29 Pre-test Waves on a String. Notes: Introduction to Waves . Lab: Waves on a String Activity (PhET) Do: read 12.3 p457 (1,3,5) 1/30 Clicker questions: Waves on a String. Lab: Fourier-Making Waves part 1 (PhET) 2/1 Lab: Fourier-Making Waves part 2 (PhET)

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