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43 Cards in this Set

  • Front
  • Back
Sound is a disturbance that travels through a______ as a _____ wave.
medium
longitudinal wave
How are sounds made?
Vibrations from an object or person creates a disturbance and pushes modlecules together to make a compression.
When molecules move forward after a compression what does it create?
rarefaction
Give an example of the wave sound is made?
Larynx- the vocal cords
Does sound travel faster through gas or solid?
Solid
Does a liquid transmit sound better or solid?
Solid
Does a liquid tramsmit sound better or does a gas?
Liquid
How does sound bend?
By diffraction when the sound waves spread out after going through an opening or around corner
The speed of sound depends on what?
Elasticity, density and temperature of the medium
What is the ability of material to bounce back ?
Elasticity
Do more elastic or less elastic mediums transmit sound better?
more elastic
What do you call the amount of matter or mass in a given amount of space?
density
When materials are the SAME state of matter how do particles move?
Not as fast because it is more dense.
What do higher temperatures do in a medium?
Speed up the particles
Does sound travel faster in warmer or cooler mediums?
Warmer
When the speed of sound was first broken, what did Chuck yeager do?
He went to 12,00 meters where the temp. is less so that the SPEED OF SOUND IS SLOWER
Which property of sound is the amount of energy that the wave carries.?
INTENSITY
How is intensity measured?
In watts per square meter (W/m2
The property of sound that you actually hear is called what ?q
LOUDNESS
What is the unit that measures the loudness or sound level?
DECIBELS (dB)
What is the audible frequency range for humans?
20-20,000 Hz
What is the frequency for ULTRASOUND?
20,000Hz INAUDIBLE TO HUMANS
What is the frequency for the INFRASOUND?
below 20Hz, inaudible to humans
What does pitch depend on?
frequency
The higher the frequency the ___ the pitch?
HIGHER
What is resonance?
When the frequency of the sound waves match the natural frequency of a medium, they can add togher and AMPLITUDE INCREASES
The APPARENT change in frequency as a wave source moves in relation to the listener is what?
DOPPLER EFFECT
WHAT WAS THE DOPPLER DEMONSTRATION?
Christian Doppler used a band on a train car to demonstrate how the Doopler effect works
As a sound wave moves toward the listener, the wave reaches the listener with a ____ frequency and the pitch ____.
higher
increase
What is the blending of the fundamental tone and the overtones of sound called?
TIMBRE
How is music made?
when the combination of fundamental tone and ovetones result in a sound with a pleasing timbre
What is an instrument that uses a string that vibrates when plucked, struck or rubbed with a bow called?
a stringed instrument
When an instrument uses a mouthpiece to create vibrations it called what?
Brass or Woodwinds
Which instrument uses vibration created by the player's lips?
Brass
Which instrument uses the vibrations created by a vibrating reed?
woodwinds
Which instrument produces vibrations when struck?
Percussions
___ has no pleasing timbre and no identifiable pitch.
Noise
When compostions and tones seem to have no musical relationship it is called _____?
Dissonance
When two or more sound waves interact it is called ____?
interference of sound waves
The WAY in which sound waves interact is called what ?
ACOUSTICS
What is "canceling sound" ?
destructive interference can be used to cancel noice and leaves only music
When two sounds are close infrequency and they combine so that they are BOTH constructive and destructive it leads to _____
beats because the repeated change in loudness are called beats
I am not finished yet folks!
see more to come but it will get you started...