Sound Waves What's Happening? Wave Basics Wave Behaviors Sound Changes Sound Math 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500 Theme End Round Final Jeopardy

Give the name for this type of wave: Wave Basics 100 Points Give the name for this type of wave:  

Longitudinal (or Compression) Wave Basics 100 Points Longitudinal (or Compression) Wave

Give the name for this type of wave: Wave Basics 200 Points Give the name for this type of wave:  

Wave Basics 200 Points Transverse Wave

What is the definition of a wave's frequency? Wave Basics 300 Points What is the definition of a wave's frequency?  

Frequency = #cycles/sec Wave Basics 300 Points Frequency = #cycles/sec How “often” it occurs

Wave Basics 400 Points Longitudinal waves have _____ and _____, like the crests and troughs of transverse waves.  

Compressions and rarefactions Wave Basics 400 Points Compressions and rarefactions

Wave Basics 500 Points Draw a repeating longitudinal wave, and then draw a box around one wavelength.  

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Wave Behaviors 100 Points A wave hits a wall and bounces back towards its source. What is this called?  

Wave Behaviors 100 Points Reflection

Wave Behaviors 200 Points A wave encounters a small opening in a wall and pushes through it, spreading its energy all around as it does so. What is this called?  

Wave Behaviors 200 Points Diffraction

Wave Behaviors 300 Points  You perceive a wave source to have higher frequency as it comes towards you; you perceive a wave source to have lower frequency as it moves farther away. What is this called?  

Wave Behaviors 300 Points Doppler Effect

Wave Behaviors 400 Points The A-string on a guitar starts to vibrate when you play the same note on a flute form across the room. What behavior of sound waves causes this?  

Wave Behaviors 400 Points Resonance

Two objects resonate when they vibrate at their Wave Behaviors 500 Points Two objects resonate when they vibrate at their _______ _______ .  

Wave Behaviors 500 Points Natural Frequencies

Sound Changes 100 Points Different sound pitches are achieved with different wave _____________.  

Sound Changes 100 Points Frequencies

Sound Changes 200 Points For every +10 decibel of difference, the loudness (or sound intensity) gets ____ louder.  

Sound Changes 200 Points x10

Sound Changes 300 Points The temperature yesterday was 70 degrees Fahrenheit. The temperature today is 60 degrees Fahrenheit. How did the speed of sound change from yesterday to today?  

Sound traveled faster yesterday than it did today. Sound Changes 300 Points Sound traveled faster yesterday than it did today.

Sound Changes 400 Points When you turn up the volume on your stereo, what property of the sound waves are you changing?  

Sound Changes 400 Points Amplitude

Sound Changes 500 Points You're hiking up Mount Everest, and it's getting harder to breathe. Air is thinner up there than it is in your physics classroom! What happens to the speed of sound as you ascend the mountain?  

As air gets thinner (AKA less dense), the speed of sound decreases. Sound Changes 500 Points As air gets thinner (AKA less dense), the speed of sound decreases.

What's Happening? 100 Points You say something in an empty room and you hear your own voice echo back. What property of waves accounts for this?  

What's Happening? 100 Points Reflection

What's Happening? 200 Points As someone falls off a cliff, his scream seems to change gradually to a lower pitch. He's not actually changing his pitch. What's going on here?  

What's Happening? 200 Points Doppler Effect

What's Happening? 300 Points Close your eyes and imagine that you hear a constant sound that's getting closer to you. In addition to getting louder, what is happening to the pitch of this sound?  

What's Happening? 300 Points Pitch is getting higher

What's Happening? 400 Points Two rooms located next to each other have their doors open. When a teacher talks in one room, the other room's students can hear her. There is no direct path between the two rooms. What behavior of waves makes this possible?  

What's Happening? 400 Points Diffraction

What's Happening? 500 Points Bats use echolocation to “see” their surroundings. They send out sound pulses and determine what their surroundings look like by the time it takes for those pulses to bounce back. If a bat is flying towards its prey, what TWO wave properties affect how the bat perceives its prey's movement?  

Reflection and the Doppler Effect Similarity 500 Points Reflection and the Doppler Effect

Sound Math 100 Points A wave cycles through 6 times in 24 seconds. What is the period of this wave?  

Sound Math 100 Points 4 seconds

Sound Math 200 Points Sound is traveling at 343 m/s. If the frequency of a note is 686 Hz, what is the wavelength of that note?  

Sound Math 200 Points 0.5 meters

Sound Math 300 Points If the cry of a hawk is one thousand times louder than the squeak of a mouse, how many decibels of difference is this?  

Sound Math 300 Points 30 dB

Sound Math 400 Points If one sound is 30 dB, and another sound is 50 dB, how much louder than the first sound is the second sound?  

Sound Math 400 Points 100 times louder

Sound Math 500 Points A bat uses echolocation to find prey. If a bat sends out a sound pulse that echoes back to it in 2 seconds, how far away is the object it hit? Speed of sound = 343 m/s  

Sound Math 500 Points 343 meters

Sound Final Jeopardy

Does sound travel fastest in air, water, or solid? Why? FINAL JEOPARDY Does sound travel fastest in air, water, or solid? Why?  

FINAL JEOPARDY SOLID Because the particles in a solid are the closest together (AKA the most dense), and therefore particles have an easier time bumping into each other. Note the opposite scenario, where sound cannot travel in space because space is a vacuum (no particles).