Slide 1 / 102 Slide 2 / 102 8th Grade Wave Properties - - PowerPoint PPT Presentation

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8th Grade

Wave Properties Classwork-Homwork Slides

2015-10-15 www.njctl.org

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Classwork #1: What is a Wave?

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1 What causes a wave?

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2 In terms of wave motion, define medium.

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3 In your own terms, define equilibrium position.

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4 Compare/Contrast Pulse and Wave.

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5 In a transverse wave, compare the direction of vibration of the particles in the medium to the direction that the wave is moving.

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6 List at least 3 examples of wave motion as witnessed in your daily life.

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Homework: What is a Wave?

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7 Explain how a disturbance in a medium causes a wave to form.

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8 List 3 examples of wave motion. List the medium for each type of wave.

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9 Make a sketch that shows the difference between a pulse and a wave.

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10 Make a sketch of a transverse wave. Include directions of particle vibration and direction of wave motion.

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11 Define the concept of equilibrium/rest position and explain what causes matter in the medium to move away from this position during wave motion.

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Classwork #2: Parts of a Wave

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12 Label the parts of a wave seen below including Crests, Troughs, Equilibrium/Rest position, Amplitude, and wavelength. Crests Troughs Equilibrium/ Rest position Amplitude Wavelength

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13 Define the following terms: Crest- Trough- Equilibrium/Rest Position- Amplitude- Wavelength-

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14 Define/Compare Frequency and Period.

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15 If a wave has a period of 0.5 s, what is its frequency?

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16 If a wave has a frequency of 100 Hz, What is its period?

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17 What happens to the frequency of a wave as the period of the wave INCREASES?

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Homework: Parts of a Wave

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18 Produce a sketch of a wave that labels the wave’s crests, troughs, amplitude, wavelength, and equilibrium position.

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19 What is the SI unit for frequency?

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20 What is the equation for calculating frequency when we know the wave period?

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21 What is the wave period when the frequency is 250 Hz?

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22 What the wave frequency when the period is 0.2 s?

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Classwork #3: The Wave Equation

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23 Write the wave equation and list the units for each variable in this equation.

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24 What is the wave velocity when a water wave has a wavelength of 2 m and a frequency of 2 Hz?

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25 What is the wave velocity when a sound wave has a frequency of 512 Hz and a wavelength of 0.67 m?

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26 What is the wavelength of a sound wave that has a frequency of 800 Hz, and a velocity of 340 m/s?

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27 What is the wavelength of a slinky wave that travels at 35 m/s and has a frequency of 7 Hz?

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28 What is the frequency of a wave that tidal wave that travels at a velocity of 100 m/s and has a wavelength of 33.33 m?

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Homework: The Wave Equation

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29 This is the wave equation, define each symbol & list the unit for each variable.

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30 What is the velocity of a sound wave with a frequency of 300 Hz and a wavelength of 1.14 m?

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31 What is the wavelength of a water wave that travels at a velocity of 33 m/s with a frequency of 11 Hz?

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32 What is the velocity of a seismic wave that has a wavelength of 3m and a frequency of 500 m/s?

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33 What is the frequency of a vibration that travels at a velocity of 99 m/s with a wavelength of 9 m?

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Classwork #4: Properties of Waves

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34 Draw and describe what happens to a reflected wave and the energy is transports.

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35 Compare and contrast free end and fixed end reflection for a wave in a string.

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36 Describe what wave transmission is an give an example.

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37 Why is it hard to hear someone that is yelling from far away?

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38 Define refraction and describe what happens to a wave's velocity and wavelength as it moved from a) a less dense to a denser medium (example: air to water) and b) a denser to less dense medium (example: diamond to air).

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39 Draw a diagram of diffraction and list a basic definition of the phenomenon.

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40 Define Constructive and Destructive Interference.

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Homework: Properties of Waves

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41 Explain why you might be able to hear a television that is playing in the next room through the walls. Why might the sound be muffled?

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42 What is diffraction? What factors increase the amount of diffraction?

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43 What is refraction? What happens to the a) velocity, b) frequency, and c) wavelength of a wave as it changes medium?

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44 Draw a sketch of 2 wave pulses in a string that are undergoing constructive interference a) before they collide, b) during the collision, and c) after the collision.

Before During After

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45 Draw a sketch of 2 wave pulses in a string that are undergoing destructive interference a) before they collide, b) during the collision, and c) after the collision.

Before During After

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Classwork #5: Sound as a Wave

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46 What is the source of any sound wave?

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47 Compare the sound waves produced by longer/shorter vibrating objects.

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48 Relate the terms frequency and pitch in terms of sound waves.

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49 Relate the terms amplitude and loudness in terms of sound waves.

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50 What is the hearing frequency range for most human beings?

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Homework: Sound as a Wave

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51 How do vibrating objects create sound waves?

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52 What is the unit for wave amplitude? How does the ear interpret amplitude of sound waves?

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53 What is the unit for wave frequency? How does the ear interpret frequency of sound waves?

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54 Explain how the length of a musical instrument affects the frequency/pitch of the sound waves it produces.

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55 Speculate on the effect of aging on the frequency range that is detectible by the human ear. (use the internet as a research tool if necessary)

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Classwork #6: Sound as a Mechanical Wave

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56 What is a mechanical wave?

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57 Why can you hear in space?

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58 Define a longitudinal wave. Draw a diagram to illustrate the compressions and rarefactions.

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59 Compare/Contrast Compressions and rarefactions.

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60 Compare vibrational direction of a medium to wave direction for a longitudinal wave.

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Homework: Sound as a Mechanical Wave

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61 How are longitudinal waves similar and different to transverse waves?

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62 Draw a diagram that makes the analogy of a longitudinal wave into a transverse drawing.

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63 Why does a vibrating object require a medium to produce sound?

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64 Where is pressure greatest? In a compression or

• rarefaction. Explain.

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65 Write a paragraph on how the ear detects sound waves during hearing.

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Classwork #7: Properties of Sound Waves

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66 How is the wave property of reflection used in SONAR?

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67 What is the speed of sound in air if it travels a distance of 3740 m in 11 seconds?

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68 Explain the effect of increasing air temperature on the speed of sound in air.

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69 How far are we away from a mountain if an echo returns in 15 seconds if the speed of sound in air is 340 m/s?

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70 Explain the concept of “echolocation” as used by dolphins and bats.

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Homework: Properties of Sound Waves

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71 When would you hear thunder the sooner, on a hot day or a cold day?

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72 What is an echo? How do animals utilize echoes in feeding?

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73 What is the speed of sound in air if it travels a distance of 5610 m in 12 seconds?

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74 How far are we away from a mountain if an echo returns in 9 seconds if the speed of sound in air is 340 m/s?

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Classwork #8: The Doppler Effect

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75 Define the Doppler Effect.

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76 Explain an example of the Doppler Effect that you have observed in your daily life.

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77 This is a diagram of the Doppler Effect. In your

• wn terms, explain what happens in front/In back
• f the moving sound source.

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78 What happens to the frequency heard by an

• bserver that is moving toward a stationary sound

source?

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79 What happens to the sound waves of a sound source that is moving at the speed of sound? Draw a diagram to illustrate this event.

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Homework: The Doppler Effect

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80 Draw a diagram of the Doppler Effect and explain it in your own terms.

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81 What happens to the wavelength and frequency of sound waves: A in front of a moving sound source? B in back of a moving sound source?

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82 Draw a diagram of a sound source moving at supersonic speeds. Explain your diagram.

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83 Draw a diagram of the sound waves surrounding a stationary sound source. Does the Doppler Effect apply to this situation? Why or Why not?

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84 When a car drives by us blowing its horn, how does the Doppler Effect apply to this situation?