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40 Cards in this Set
- Front
- Back
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Sound is a ______ that travels through a _____ as a ______ wave.
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disturbance
medium longitudinal wave |
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How are sounds made?
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vibrations from whatever making the sound create the disturbance, which then pushes the molecules , when molecules move forward, it creates a rarefaction.
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Which part of the body produces sound?
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Larynx
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Sound travels faster through solid or gas?
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solid
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What is diffraction?
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when sound waves spread out after going through an opening or around a corner
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The ability of material to bounce back is called what?
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elasticity
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Is more or less elasticity needed for good sound?
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More
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What is density?
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how much matter or mass is in a given amount of space
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In a materials of the same state of matter, particles do or don't move as quickly in a more DENSE MATERIAL?
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DO NOT
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Temperatures that are higher ___ ___ the particles in a medium?
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speed up
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Sound travels faster in ______ mediums than ____ ones.
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warmer
cooler |
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The amount of energy that the wave carries is called ____ and is measured in _____?
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intensity
watts per sq. meter |
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What you acutally hear is called ____ and is measured in _____.
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loudness
decibels |
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What is ultrasound?
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sounds above 20,000Hz, in audible to human
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What is infrasound?
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sounds below 20Hz, inaudible to humans
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Pitch depends on what?
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frequency, the higher the frequencey the higher the pitch
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When the frequency of the sound waves match the natural frequency of the medium, they can add together and amplitude increases is an explanation of what?
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RESONANCE
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The apparent change in frequency as a wave source moves in RELATION TO THE LISTENER is called what?
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DOPPLER EFFECT
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The blending of fundamental tone and overtones are called what?
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timbre
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Insturments that use a string which vibrates when plucked, struck or rubbed with a bow is called?
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stringed instrument
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Brass and Woodwinds are instruments that have a _______ to create vibrations.
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mouthpiece
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The players' _____ make vibrations on brass instruments?
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mouths
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A vibrating reed creates sound for ___________.
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woodwinds
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Percussions make sounds when _____.
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struck
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When compositions and tones seem to have no musical relationship, it is called
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dissonance
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Interference is when what happens?
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when two or more sound waves interact
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Acoustics happen when two or more sound waves do what?
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interact in specific room or hall
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Repeated change in loudness is called ____?
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beats
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When 2 sounds are close in frequency that can do what?
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be both constructive and destructive.
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The EAR CANAL does what?
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funnels wa es into the ear toward the eardrum
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The Middle Ear has the ____ ____ and the ____.
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hammar, anvil and stirrup
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What part of the ear sends messages to the brain?
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The cochlea which is shaped like a snail shell is lined with tiny hairs and filled with liquid
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What happens in in the COCHLEA?
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HAIRS in the cochlea vibrate and the movement is picked up by nerve fibers which send messages to the brain.
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When there is damage or infection to the ear drum or the bones of the ear, what may take place?
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permanent hearing loss
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What also causes hearing loss/
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aging and particularly true of certain frequencies
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What animal uses ecolocation?
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bats and dolphins
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Ecolocation is natural sonar that uses echoes or ____ waves
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reflected
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Bats use echolocation to navagate, hunt prey and their sounds are about _______ Hz.
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100,000
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a device that uses sound to create a picture is?
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SONOGRAM
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SONOGRAMS can break up ____ ___ and treat soft tissue.
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kidney stones
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