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7th Grade Science Ch. 3
7th Grade Science Ch. 3
24
Science
7th Grade
09/29/2014

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Term
compression
Definition
area of bunched-up air pariticles created by an object's vibrations, which push the air particles in front of its movements closer together; compressions and rarefactions spread out from the vibrating object in all directions and pass through a medium to provide sound
Term
rarefaction
Definition
area of spread out air particles created by an object's vibrations that occurs opposite an are of compression and rarefaction traveling through a medium
Term
medium
Definition
any sound conducting liquid, solid, or gas; for example, you hear most sounds through the medium of air, which conducts the sound produced by a vibrating object to your ears
Term
frequency
Definition
number of times an object vibrates in 1 second; frequency is measured in hertz and is recognized by your ears as differences in pitch
Term
hertz (hz)
Definition
unit that measures frequency of 1 vibration/second or cycle/second; for example, dolphins hear sounds up to about 155,000 hertz (hz)
Term
pitch
Definition
the highness of lowness of a sound; the slower the vibration of an object the lower its itch, and the faster its vibration, the higher its pitch
Term
Explain how a vibrating object that is some distance away from you causes your eardrums to vibrate.
Definition
it creates a pattern of compression and rarefaction in the particles in the air which is carried to your ear
Term
Why can you identify different musical instruments just by listening, even when they are playing the same pitch?
Definition
instruments have different sound qualities depending on their shape, size and material
Term
All sounds are produced by ____________.
Definition
vibrating objects
Term
_________ is made up of particles so tiny you cannot see them.
Definition
air
Term
________ produce sound by creating patterns of compression and rarefaction.
Definition
vibrations
Term
Your ears give you ________ about things you can't see.
Definition
information
Term
The number of times an object moves back and forth in one second is one way to keep track of an objects _________.
Definition
motion
Term
Your ears recognize differences in sound __________ ad differences in pitch.
Definition
frequencies
Term
Both music and noise are ________.
Definition
sounds
Term
________ are visual records of sound vibrations.
Definition
audiograms
Term
Objects that create noise in contrast to music produce _______________.
Definition
unorganized patterns
Term
The type of material from whch an object is made and the object's shape also affect the frequency at which an object _________.
Definition
resonates
Term
__________ produce the lowest notes, while _________ produce higher notes.
Definition
longer pipes, shorter pipes
Term
A ________ vibrating alone sets some particles of air in motion.
Definition
tuning fork
Term
What must you know inorder to determine the frequency or pitch of a sound source?
Definition
how many times the sound source vibrates
Term
What creates the pattern of sound that travels to your ear when an object vibrates?
Definition
compression and rarefaction
Term
In what unit is frequency measured?
Definition
hertz
Term
How does sound travel in air compared to water?
Definition
sound travels faster in water than in air
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