ࡱ>  Rbjbjyy ;MJ~ $$$$$8888p, 8yT80"N*t,<SSSSSSS$KXZT$-"""--T$$43T000-F$$S0-S00FH@s#D.FGSIT0yTG\[.8[0HH[$O4--0-----TT0---yT----[--------- : Unit SummaryHow are waves used to transfer energy and send and store information? In this unit of study, students apply their understanding of how wave properties can be used to transfer information across long distances, store information, and investigate nature on many scales. The crosscutting concept of cause and effect is highlighted as an organizing concept for these disciplinary core ideas. Students are expected to demonstrate proficiency in using mathematical thinking, and to use this practice to demonstrate understanding of the core idea.Student Learning ObjectivesUse mathematical representations to support a claim regarding relationships among the frequency, wavelength, and speed of waves traveling in various media. [Clarification Statement: Examples of data could include electromagnetic radiation traveling in a vacuum and glass, sound waves traveling through air and water, and seismic waves traveling through the Earth.] [Assessment Boundary: Assessment is limited to algebraic relationships and describing those relationships qualitatively.] ( HYPERLINK "http://www.nextgenscience.org/sites/ngss/files/HS-PS4-1_Evidence%20Statements%20Jan%202015.pdf" HS-PS4-1) Quick Links HYPERLINK \l "sequence" Unit Sequence. 2   HYPERLINK \l "looks" What it Looks Like in the Classroom p. 2   HYPERLINK \l "ELA" Leveraging ELA/Literacy and Math p. 3   HYPERLINK \l "modifications" Modifications p. 3   HYPERLINK \l "research" Research on Learning p. 4   HYPERLINK \l "prior" Prior Learning p. 4  HYPERLINK \l "disciplines" Connections to Other Courses p. 5   HYPERLINK \l "OER" Sample Open Education Resources p. 5  HYPERLINK \l "Appendix" Appendix A: NGSS and Foundations p. 6  Part A: Why do physicists make the best surfers? How do we know what the inside of the Earth looks like? ConceptsFormative AssessmentThe wavelength and frequency of a wave related to one another by the speed of travel of the wave, which depends on the type of wave and the medium through which it is passing. Empirical evidence is required to differentiate between cause and correlation and to make a claim regarding relationships among the frequency, wavelength, and speed of waves traveling in various media. Students who understand the concepts are able to: Use mathematical representations to support a claim regarding relationships among the frequency, wavelength, and speed of waves traveling in various media. Use algebraic relationships to quantitatively describe relationships among the frequency, wavelength, and speed of waves traveling in various media.  What it Looks Like in the ClassroomIn this unit, students will learn to identify and describe the characteristics of waves, including crests, troughs, speed, frequency, and amplitude. Students should also be able to identify nodes and antinodes. Students will use mathematical representations to show relationships among frequency, wavelength, and speed of waves using  EMBED Equation.3 or, equivalently,  EMBED Equation.3  (note that  EMBED Equation.3  and  EMBED Equation.3  are used interchangeably to represent the frequency of a wave). These relationships should be explored for waves traveling through various media such as electromagnetic radiation traveling in a vacuum or through glass, sound waves traveling through air and water, and seismic waves traveling through the Earth. Density of materials should be considered in examination of waves traveling through different media. In calculations, students should be able to rearrange formulas to highlight quantities of interest. This unit will focus on mechanical waves, and students should develop an understanding that mechanical waves require a physical medium. Light waves will be addressed in terms of making claims about relationships among frequency, wavelength, and speed through calculations, and making observations of properties such as reflection and refraction. This foundation will provide the basis for addressing the unit on electromagnetic radiation waves more completely. Students will also explore both wave and particle models of electromagnetic radiation in the Electromagnetic Radiation Unit. Students should develop an understanding of period with respect to frequency. Frequency is a quantity of ratehow often something occurs. Period is a quantity of timehow long it takes for something to occur. Students should have opportunities to investigate period and frequency. Students should develop an understanding that wave speed changes only as a result of a change in the waves medium. For example, the speed of sound in air at STP is about 343 m/s, but the speed will also change due to changes in temperature and pressure of air. Students might investigate why Mach numbers change depending on altitude. Students can also consider the speed of light through air (2.998 x 108 m/s) and the speed of light in water (2.256 x 108 m/s). As students make claims using evidence from calculations, they should describe cause-and-effect relationships between changes in wave speed and type of media through which the wave travels. Claims should be based on evaluation of multiple sources of information and data. In the previous unit, students considered the importance of P-waves and S-waves in understanding the composition of Earths interior. They could now explore the properties of those waves in more detail by looking for relationships between seismic wave behavior and the Earths internal composition. Other examples may include citation vocalizations and submarine transmissions. Some classroom activities might include using two linked, coiled springs of different materials to observe how wave behavior changes as it propagates from one medium to the next; placing a rod in a cylinder with fluids of different densities to observe refraction; and using a laser, Plexiglas rectangle, and protractor to determine the index of refraction. Students might also perform a vibrating string exercise. This could also be done with pitch analysis of sound (e.g., musical notes), using a computer simulation or tuning forks so that students can determine relationships between frequency and pitch. Students should be able to distinguish between longitudinal, transverse, and surface mechanical waves and their behavior in different media. For example, sound is a longitudinal wave, whereas seismic S-waves are transverse waves. In a longitudinal wave, the particles of the medium move back and forth in the direction of the wave. In transverse wave propagation, the particles of the medium move in a perpendicular direction to the wave. Students should also know that surface waves propagate along the interface between two media with different densities, like the surface of a lake and air. Because earthquakes can produce both transverse and longitudinal waves, students should explore the relationship between transverse waves, longitudinal waves, and the Earths molten core. Students should be able to make predictions about the behavior of waves traveling in various media and to discuss energy transmission, reflection, refraction, transmission, absorption, diffraction, and resonance. Integration of DCI from other science units To examine an example of wave energy transfer, students might conduct research and analyze data from the 2004 tsunami in the Indian Ocean. Students can examine waves in terms of energy transport, transformations, transfer, and conservation. Students can also build on their understanding of seismic waves from the Unit of Plate Tectonics, relating the behavior of seismic waves to the different composition of the layers of Earths internal structure.  Leveraging English Language Arts/Literacy and MathematicsEnglish Language Arts/Literacy Integrate and evaluate multiple sources of information presented in diverse formats and media (e.g., quantitative data, video, multimedia) in order to support a claim regarding relationships among the frequency, wavelength, and speed of waves traveling in various media. Mathematics Represent symbolically relationships among the frequency, wavelength, and speed of waves traveling in various media, and manipulate the representing symbols. Make sense of quantities and relationships among the frequency, wavelength, and speed of waves traveling in various media. Use a mathematical model to support a claim regarding relationships among the frequency, wavelength, and speed of waves traveling in various media. Identify important quantities representing the frequency, wavelength, and speed of waves traveling in various media and map their relationships using tools. Analyze those relationships mathematically to draw conclusions, reflecting on the results and improving the model if it has not served its purpose. Interpret expressions that represent the frequency, wavelength, and speed of waves traveling in various media in terms of their context. Choose and produce an equivalent form of an expression to reveal and explain properties of the frequency, wavelength, and speed of waves traveling in various media. Rearrange formulas to highlight a quantity of interest, using the same reasoning as in solving equations when representing the frequency, wavelength, and speed of waves traveling in various media. ModificationsTeacher Note: Teachers identify the modifications that they will use in the unit. Restructure lesson using UDL principals ( HYPERLINK "http://www.cast.org/our-work/about-udl.html" \l ".VXmoXcfD_UA" http://www.cast.org/our-work/about-udl.html#.VXmoXcfD_UA) Structure lessons around questions that are authentic, relate to students interests, social/family background and knowledge of their community. Provide students with multiple choices for how they can represent their understandings (e.g. multisensory techniques-auditory/visual aids; pictures, illustrations, graphs, charts, data tables, multimedia, modeling). Provide opportunities for students to connect with people of similar backgrounds (e.g. conversations via digital tool such as SKYPE, experts from the community helping with a project, journal articles, and biographies). Provide multiple grouping opportunities for students to share their ideas and to encourage work among various backgrounds and cultures (e.g. multiple representation and multimodal experiences). Engage students with a variety of Science and Engineering practices to provide students with multiple entry points and multiple ways to demonstrate their understandings. Use project-based science learning to connect science with observable phenomena. Structure the learning around explaining or solving a social or community-based issue. Provide ELL students with multiple literacy strategies. Collaborate with after-school programs or clubs to extend learning opportunities. Research on Student LearningStudents who have not received any systematic instruction about light tend to identify light with its source (e.g., light is in the bulb) or its effects (e.g., patch of light). They do not have a notion of light as something that travels from one place to another. As a result, these students have difficulties explaining the direction and formation of shadows, and the reflection of light by objects. For example, some students simply note the similarity of shape between the object and the shadow or say that the object hides the light. Students often accept that mirrors reflect light but, at least in some situations, reject the idea that ordinary objects reflect light. Many students do not believe that their eyes receive light when they look at an object. Students' conceptions of vision vary from the notion that light fills space ("the room is full of light") and the eye "sees" without anything linking it to the object to the idea that light illuminates surfaces that we can see by the action of our eyes on them. The conception that the eye sees without anything linking it to the object persists after traditional instruction in optics. And some students can understand seeing as "detecting" reflected light after specially designed instruction (NSDL, 2015). Students frequently harbor misconceptions about waves regarding frequency, period, amplitude, changing media, and wave speed (RI, 2015). Prior LearningPhysical science A simple wave has a repeating pattern with a specific wavelength, frequency, and amplitude. A sound wave needs a medium through which it is transmitted. When light shines on an object, it is reflected from, absorbed by, or transmitted through the object, depending on the objects material and the frequency (color) of the light. The path that light travels can be traced as straight lines, except at surfaces between different transparent materials (e.g., air and water, air and glass) where the light path bends. A wave model of light is useful for explaining brightness, color, and the frequency-dependent bending of light at a surface between media. However, because light can travel through space, it cannot be a matter wave, like sound or water waves.  Connections to Other Courses Earth and space science Earths systems, being dynamic and interacting, cause feedback effects that can increase or decrease the original changes. Evidence from deep probes and seismic waves, reconstructions of historical changes in Earths surface and its magnetic field, and an understanding of physical and chemical processes lead to a model of Earth with a hot but solid inner core, a liquid outer core, and a solid mantle and crust. Motions of the mantle and its plates occur primarily through thermal convection, which involves the cycling of matter due to the outward flow of energy from Earths interior and gravitational movement of denser materials toward the interior. The geological record shows that changes to global and regional climate can be caused by interactions among changes in the suns energy output or Earths orbit, tectonic events, ocean circulation, volcanic activity, glaciers, vegetation, and human activities. These changes can occur on a variety of time scales from sudden (e.g., volcanic ash clouds) to intermediate (ice ages) to very long-term tectonic cycles. Samples of Open Education Resources for this Unit HYPERLINK "https://phet.colorado.edu/en/simulation/legacy/wave-on-a-string" Wave on a string: Students will watch a wave on a string. Adjusting the amplitude, frequency, damping and tension will demonstrate wave properties.  HYPERLINK "https://phet.colorado.edu/en/contributions/view/3177;jsessionid=58F527D82E12BCB550FDC069BD4BB1C5" Slinky Lab: Students will observe patterns of waves and their interactions using a slinky.  HYPERLINK "https://phet.colorado.edu/en/simulation/legacy/wave-interference" Ripple Tank: Students will investigate wave properties (speed in a medium, reflection, diffraction, interference) using the PhET virtual ripple tank, or use an actual  HYPERLINK "http://www.opensourcephysics.org/items/detail.cfm?ID=9989" ripple tank.  HYPERLINK "http://hyperphysics.phy-astr.gsu.edu/hbase/class/phscilab/restube2.html" Resonance Tube: Velocity of Sound. Students will observe the resonance phenomenon in an open ended cylindrical tube, and use the resonance to determine the velocity of sound in air at ordinary temperatures.  HYPERLINK "https://phet.colorado.edu/sims/resonance/resonance_en.html" Resonance: Students will identify, through experimentation, cause and effect relationships that affect natural resonance of these systems.  HYPERLINK "https://phet.colorado.edu/en/simulation/sound" Sound Waves: Students will adjust the frequency to both see and hear how the wave changes to explain how different sounds are modeled, described, and produced.  HYPERLINK "http://www.opensourcephysics.org/items/detail.cfm?ID=7902" Doppler Effect: Students will explore the detection of sound waves from a moving source and the change in frequency of the detected wave via the Doppler effect.  HYPERLINK "http://sandyco.weebly.com/uploads/1/5/6/8/15687572/refraction_through_glassslab1.pdf" Refraction through Glass: Students will trace the course of different rays of light through a rectangular glass slab at different angles of incidence, measure the angle of incidence, refraction, measure the lateral displacement to verify Snell`s law. Appendix A: NGSS and Foundations for the Unit The Student Learning Objectives above were developed using HYPERLINK "http://www.nextgenscience.org/2ess2-earth-systems" \l "framework" the following elements from the NRC documentA Framework for K-12 Science Education:Science and Engineering PracticesDisciplinary Core IdeasCrosscutting Concepts HYPERLINK "http://www.nap.edu/openbook.php?record_id=13165&page=64" Using Mathematics and Computational Thinking Use mathematical representations of phenomena or design solutions to describe and/or support claims and/or explanations. (HS-PS4-1)  HYPERLINK "http://www.nap.edu/openbook.php?record_id=13165&page=131" PS4.A: Wave Properties The wavelength and frequency of a wave are related to one another by the speed of travel of the wave, which depends on the type of wave and the medium through which it is passing. (HS-PS4-1) HYPERLINK "http://www.nap.edu/openbook.php?record_id=13165&page=87" Cause and Effect Empirical evidence is required to differentiate between cause and correlation and make claims about specific causes and effects. (HS-PS4-1) Embedded English Language Art/Literacy and MathematicsEnglish Language Arts/Literacy Integrate and evaluate multiple sources of information presented in diverse formats and media (e.g., quantitative data, video, multimedia) in order to address a question or solve a problem. (HS-PS4-1)  HYPERLINK "http://www.corestandards.org/ELA-Literacy/RH/11-12/" \l "CCSS.ELA-Literacy.RH.11-12.7" RST.11-12.7Mathematics  HYPERLINK "http://www.corestandards.org/Math/Practice/MP2" Reason abstractly and quantitatively.  (HS-PS4-1)  HYPERLINK "http://www.corestandards.org/Math/Practice/MP2" MP.2  HYPERLINK "http://www.corestandards.org/Math/Practice/MP4" Model with mathematics.  (HS-PS4-1)  HYPERLINK "http://www.corestandards.org/Math/Practice/MP4" MP.4 Interpret expressions that represent a quantity in terms of its context. (HS-PS4-1)  HYPERLINK "http://www.corestandards.org/Math/Content/HSA/SSE/" \l "CCSS.Math.Content.HSA.SSE.A.1" HSA-SSE.A.1 Choose and produce an equivalent form of an expression to reveal and explain properties of the quantity represented by the expression. (HS-PS4-1)  HYPERLINK "http://www.corestandards.org/Math/Content/HSA/SSE/" \l "CCSS.Math.Content.HSA.SSE.B.3" HSA-SSE.B.3 Rearrange formulas to highlight a quantity of interest, using the same reasoning as in solving equations. 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