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