Sound Review Notes Item #
__________________
____________Sound_________________________________ is a wave that vibrates particles of matter
______________________Vibration________________________ a rapid back and forth movement
Silent Solo
CFU-What is the connection between “Sound” & “Vibration”? _____________________________
______________________________
Vibrations are the way that sound is made
_____________________________
Decibels (dB)
Decibels are a measurement of _________________________________.
10 dB _______________________, _______________________ dB whisper,
_________________ dB people talking, 80 dB ________________________
100 dB _____________________, _____________________ dB Firecrackers
Dispersion is the spreading out of energy
Turn & Talk
CFU: Give…
 1 example of when sound has a dispersion that is often times thought of being spread near; A PERSON WISHPERING and
 1 example of when a sound has a dispersion that is often times thought of being spread far. A FIRE TRUCK DOWN THE STREET

Sound Guided Notes
Is there sound in space?
Space is a _____________________________, which means ______________________________ space or very few particles. ______________________________ have to travel through ___________________________ in order to make a sound. In space there is no ‘_________________________’ or _______________________ for the wave to _____________________________, thus no __________________________ can be produced.
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How do we produce sound?
We use our __________________________ in our body like our ____________________________ to push air up from our
_____________________ into a narrow passage (___________________) then through the _______________________ which include the _________________ ______________________ in them. Vocal cords are actually
_____________________________! Our body forces air past the ________________________________________,
which causes them to _____________________________________!
Have you ever taken a blade of grass and pinched it tight between
your fingers and blown air past it to make a loud noise? That is similar to how vocal folds work.
This entire structure to the right is the _________________________, but the white bands are the actually the ______________ ___________.
Everyone’s folds a slightly _______________________, which is why

Sound Guided Notes
we have different voices. (Shape changes ____________________.)
The _____________________________ of air causes them to
_________________________________.
That action produces __________________________________ waves!
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How do our ears hear sound waves?
Vibrations travel through the
___________________ __________________________
Then the sound waves vibrate the
_______________________________________, which moves the _________________ bones in the ear called hammer, anvil, and ________________________________
The eardrum vibrating causes the three bones in the ear to _____________________________________, which is detected by the ________________________________________________.
The ____________________________________ has millions of little _____________________________ inside ear fluid the move with the vibrations, then nerves send ___________________________ for the brain to _________________________.
What affects the speed of sound?
________________________________________ and_____________________________________________ affects the speed of sound.

Sound Guided Notes
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Speed of Sound in Different Mediums
If the mediums are all 20 degree C then the following is true . . .
In Air-Gas sound waves travel at __________________________ m/s, In Water-Liquid __________________________ m/s,
In Steel-Solid _____________________________ m/s
Why?
In order for particles to vitiate in a wave, one particle must then ___________________________ the next particle to pass on the ________________________ and continue the wave. There is not as much ___________________________ between particles in a ________________________ so the vibration wave would move _________________________. In a _______________________________ there is a lot more __________________________ in between so the particle would take ________________________________________ to hit the next. Think of it like the spacing of
___________________________________________.
Speed of Sound in Different Temperatures
If you are in the desert and in it 115 degrees F sound will travel ______________________________________________,
then if you are in the ________________________________________________ and it is -20 degrees F!
Why? At ______________________________________ temperatures particles faster. So if sound waves push against the already fast moving particles, then it will ___________________________________________ pass through and vibrate the already fast moving particles.
STOP AND THINK
What Affects the Speed of Sound?
Would sound travel faster in cold air or hot air if the humidity was the same? Why?

Sound Guided Notes
Would sound travel faster through water or bricks? Why?
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Frequency
A given number of ____________________________ in specific amount of __________________________, which determines the ______________________________________________. The ___________________________________ is a characteristic of high and low sounds. Frequency is measured in ______________________________________.
The Doppler Effect
The Doppler Effect is a change in the perceived
__________________________________ when the source of the noise is _____________________________________________.
So to further explain: All waves, light and sound, travel _______________________________ from the source, but when the source is ___________________________________________the waves get _____________________________________ closed together making a ________________________________________ frequency/pitch and the waves trailing behind become spread out making a ________________________________________________ pitch/frequency.
Amplitude
Amplitude determines __________________________________, which is just how ____________________________ sound is.
Intensity or amplitude of sound is measured in ________________________________________________ (dB).
Wave Types
_______________________________________________ waves compress-Draw Pic =>
______________________________________________ waves move up and down-Pic=>
What is an echo? _________________________________________________________________________________________________
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