OBJECTIVES: By the end of class, students will be able to DO NOW
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1 7 th Grade Science Name: Unit: EM Spectrum Lesson: EM Spectrum 2 Wave Properties 2 OBJECTIVES: By the end of class, students will be able to SWBAT identify and define wave properties DO NOW Date: Tuesday February 14, 2017 Homeroom: Agenda: 1. Do Now (in packet) 5. Independent practice (in packet) 2. Opening 6. Homework Overview 3. Notes (in packet and notebook) 7. Closing 4. Guided Practice (in packet) Homework: Day 2 Label the parts of the waves. Use the box below for help. Crest Amplitude Trough Wavelength Resting point 1. Circle which wave has more frequency. How do you know? 1
2 Review: Word Definition Picture Wave Wavelength Frequency Amplitude Which types of waves have the highest energy? Short wavelengths and tall amplitude / long wavelengths and short amplitude Circle the wave with the most energy. 2
3 1. Which wave has the largest amplitude? 2. Which waves has highest frequency? 3. Which wave has the largest wavelength? 4. Label each wave for wavelength, amplitude, crest, trough, and use a ruler to draw the resting point. 5. Draw a wave with high amplitude and a short wavelength below. How did you know what to draw? 3
4 6. Draw a wave with low amplitude and a long wavelength below. How did you know what to draw? 7. Draw a wave with high frequency and high energy. How did you know what to draw? 8. Draw a wave with low frequency and low energy. How did you know what to draw? 4
5 Notes Types of Waves Waves that require a medium, the material through which the wave travels (gases, solids, and liquids), to travel are called Transverse Waves: Waves that move the (the material through which the wave travels) at a (90º) to the direction in which the waves travel. High point of a transverse wave is the. The low part is called the. Vibration Direction Wave Direction All of the waves that you will study are transverse except sound waves and P waves from earthquakes. Longitudinal Waves: Move the medium to the direction in which the wave travels. When a longitudinal wave moves through a medium, the particles of the medium move backwards and forwards along the direction in which the wave is travelling. Below is a picture of a longitudinal wave travelling along a spring. 5
6 How do you find the wavelength of a Longitudinal Wave? The wavelength of a longitudinal wave can be measured as the distance between the centers of two. What is Compression? Compression is the name given to the region where the coils of the spring are pushed. What is Rarefaction? Rarefaction is the name given to the region where the coils of the spring are pulled. **It is difficult to show the amplitude and frequency of a longitudinal wave on a picture.** Examples of longitudinal waves are P waves from earthquakes and sound waves. Draw an example of a Longitudinal Wave below. Label the compressions and rarefactions. 6
7 Independent Practice Write the definition and an extension to each word. Word Definition Extension Wave Wavelength Amplitude Frequency Medium Longitudinal Wave Transverse Wave 7
8 Label the parts of the longitudinal wave below. (wavelength, compression, rarefaction) Label the parts of the transverse wave below (wavelength, amplitude, resting point, crest, trough) 8
9 7 th Grade Science Unit: EMS Lesson: EM Spectrum 2 Wave Properties 2 Name: Date: February 14, 2017 Homeroom: /5 = % DNG? Strive Date: A B C D F 1. What are 2 the different kinds of waves? and 3. Describe what a transverse wave would look like: 4. Describe what a compressional wave would look like: 5. With each pair of words, describe how the pair of words are alike OR describe how they are different: Crest/trough Compression/rarefaction 9
10 1. Create a wave with a long wavelength. Draw a picture of what your wave looks like: (Label the crest, trough, amplitude, and wavelength) 2. Now create a wave with a short wavelength and draw it below: (label the crest, trough, amplitude, and wavelength) 3. Which of the two wave you just created has the most energy? 10
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