Slide 4 / 102 1 What causes a wave? Slide 5 / 102 2 In terms of - PDF document

Slide 1 / 102 Slide 2 / 102 8th Grade Wave Properties Classwork-Homwork Slides 2015-10-15 www.njctl.org Slide 3 / 102 Classwork #1: What is a Wave?

Slide 4 / 102 1 What causes a wave? Slide 5 / 102 2 In terms of wave motion, define medium. Slide 6 / 102 3 In your own terms, define equilibrium position.

Slide 7 / 102 4 Compare/Contrast Pulse and Wave. Slide 8 / 102 5 In a transverse wave, compare the direction of vibration of the particles in the medium to the direction that the wave is moving. Slide 9 / 102 6 List at least 3 examples of wave motion as witnessed in your daily life.

Slide 10 / 102 Homework: What is a Wave? Slide 11 / 102 7 Explain how a disturbance in a medium causes a wave to form. Slide 12 / 102 8 List 3 examples of wave motion. List the medium for each type of wave.

Slide 13 / 102 9 Make a sketch that shows the difference between a pulse and a wave. Slide 14 / 102 10 Make a sketch of a transverse wave. Include directions of particle vibration and direction of wave motion. Slide 15 / 102 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.

Slide 16 / 102 Classwork #2: Parts of a Wave Slide 17 / 102 12 Label the parts of a wave seen below including Crests, Troughs, Equilibrium/Rest position, Amplitude, and wavelength. Wavelength Equilibrium/ Rest position Amplitude Troughs Crests Slide 18 / 102 13 Define the following terms: Crest- Trough- Equilibrium/Rest Position- Amplitude- Wavelength-

Slide 19 / 102 14 Define/Compare Frequency and Period. Slide 20 / 102 15 If a wave has a period of 0.5 s, what is its frequency? Slide 21 / 102 16 If a wave has a frequency of 100 Hz, What is its period?

Slide 22 / 102 17 What happens to the frequency of a wave as the period of the wave INCREASES? Slide 23 / 102 Homework: Parts of a Wave Slide 24 / 102 18 Produce a sketch of a wave that labels the wave’s crests, troughs, amplitude, wavelength, and equilibrium position.

Slide 25 / 102 19 What is the SI unit for frequency? Slide 26 / 102 20 What is the equation for calculating frequency when we know the wave period? Slide 27 / 102 21 What is the wave period when the frequency is 250 Hz?

Slide 28 / 102 22 What the wave frequency when the period is 0.2 s? Slide 29 / 102 Classwork #3: The Wave Equation Slide 30 / 102 23 Write the wave equation and list the units for each variable in this equation.

Slide 31 / 102 24 What is the wave velocity when a water wave has a wavelength of 2 m and a frequency of 2 Hz? Slide 32 / 102 25 What is the wave velocity when a sound wave has a frequency of 512 Hz and a wavelength of 0.67 m? Slide 33 / 102 26 What is the wavelength of a sound wave that has a frequency of 800 Hz, and a velocity of 340 m/s?

Slide 34 / 102 27 What is the wavelength of a slinky wave that travels at 35 m/s and has a frequency of 7 Hz? Slide 35 / 102 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? Slide 36 / 102 Homework: The Wave Equation

Slide 37 / 102 29 This is the wave equation, define each symbol & list the unit for each variable. Slide 38 / 102 30 What is the velocity of a sound wave with a frequency of 300 Hz and a wavelength of 1.14 m? Slide 39 / 102 31 What is the wavelength of a water wave that travels at a velocity of 33 m/s with a frequency of 11 Hz?

Slide 40 / 102 32 What is the velocity of a seismic wave that has a wavelength of 3m and a frequency of 500 m/s? Slide 41 / 102 33 What is the frequency of a vibration that travels at a velocity of 99 m/s with a wavelength of 9 m? Slide 42 / 102 Classwork #4: Properties of Waves

Slide 43 / 102 34 Draw and describe what happens to a reflected wave and the energy is transports. Slide 44 / 102 35 Compare and contrast free end and fixed end reflection for a wave in a string. Slide 45 / 102 36 Describe what wave transmission is an give an example.

Slide 46 / 102 37 Why is it hard to hear someone that is yelling from far away? Slide 47 / 102 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). Slide 48 / 102 39 Draw a diagram of diffraction and list a basic definition of the phenomenon.

Slide 49 / 102 40 Define Constructive and Destructive Interference. Slide 50 / 102 Homework: Properties of Waves Slide 51 / 102 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?

Slide 52 / 102 42 What is diffraction? What factors increase the amount of diffraction? Slide 53 / 102 43 What is refraction? What happens to the a) velocity, b) frequency, and c) wavelength of a wave as it changes medium? Slide 54 / 102 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

Slide 55 / 102 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 Slide 56 / 102 Classwork #5: Sound as a Wave Slide 57 / 102 46 What is the source of any sound wave?

Slide 58 / 102 47 Compare the sound waves produced by longer/shorter vibrating objects. Slide 59 / 102 48 Relate the terms frequency and pitch in terms of sound waves. Slide 60 / 102 49 Relate the terms amplitude and loudness in terms of sound waves.

Slide 61 / 102 50 What is the hearing frequency range for most human beings? Slide 62 / 102 Homework: Sound as a Wave Slide 63 / 102 51 How do vibrating objects create sound waves?

Slide 64 / 102 52 What is the unit for wave amplitude? How does the ear interpret amplitude of sound waves? Slide 65 / 102 53 What is the unit for wave frequency? How does the ear interpret frequency of sound waves? Slide 66 / 102 54 Explain how the length of a musical instrument affects the frequency/pitch of the sound waves it produces.

Slide 67 / 102 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) Slide 68 / 102 Classwork #6: Sound as a Mechanical Wave Slide 69 / 102 56 What is a mechanical wave?

Slide 70 / 102 57 Why can you hear in space? Slide 71 / 102 58 Define a longitudinal wave. Draw a diagram to illustrate the compressions and rarefactions. Slide 72 / 102 59 Compare/Contrast Compressions and rarefactions.

Slide 73 / 102 60 Compare vibrational direction of a medium to wave direction for a longitudinal wave. Slide 74 / 102 Homework: Sound as a Mechanical Wave Slide 75 / 102 61 How are longitudinal waves similar and different to transverse waves?

Slide 76 / 102 62 Draw a diagram that makes the analogy of a longitudinal wave into a transverse drawing. Slide 77 / 102 63 Why does a vibrating object require a medium to produce sound? Slide 78 / 102 64 Where is pressure greatest? In a compression or rarefaction. Explain.

Slide 79 / 102 65 Write a paragraph on how the ear detects sound waves during hearing. Slide 80 / 102 Classwork #7: Properties of Sound Waves Slide 81 / 102 66 How is the wave property of reflection used in SONAR?

Slide 82 / 102 67 What is the speed of sound in air if it travels a distance of 3740 m in 11 seconds? Slide 83 / 102 68 Explain the effect of increasing air temperature on the speed of sound in air. Slide 84 / 102 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?

Slide 85 / 102 70 Explain the concept of “echolocation” as used by dolphins and bats. Slide 86 / 102 Homework: Properties of Sound Waves Slide 87 / 102 71 When would you hear thunder the sooner, on a hot day or a cold day?

Slide 88 / 102 72 What is an echo? How do animals utilize echoes in feeding? Slide 89 / 102 73 What is the speed of sound in air if it travels a distance of 5610 m in 12 seconds? Slide 90 / 102 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?

Slide 91 / 102 Classwork #8: The Doppler Effect Slide 92 / 102 75 Define the Doppler Effect. Slide 93 / 102 76 Explain an example of the Doppler Effect that you have observed in your daily life.

Slide 94 / 102 77 This is a diagram of the Doppler Effect. In your own terms, explain what happens in front/In back of the moving sound source. Slide 95 / 102 78 What happens to the frequency heard by an observer that is moving toward a stationary sound source? Slide 96 / 102 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.

Slide 97 / 102 Homework: The Doppler Effect Slide 98 / 102 80 Draw a diagram of the Doppler Effect and explain it in your own terms. Slide 99 / 102 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?