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Slide 7 / 102 Slide 8 / 102 4 Compare/Contrast Pulse and Wave. 5 - - PDF document
Slide 7 / 102 Slide 8 / 102 4 Compare/Contrast Pulse and Wave. 5 - - PDF document
Slide 1 / 102 Slide 2 / 102 8th Grade Wave Properties Classwork-Homwork Slides 2015-10-15 www.njctl.org Slide 3 / 102 Slide 4 / 102 1 What causes a wave? Classwork #1: What is a Wave? Slide 5 / 102 Slide 6 / 102 2 In terms 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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