click below
click below
Normal Size Small Size show me how
Quinn science O2
The Nature of Sound
Question | Answer |
---|---|
wave | a disturbance that transmits energy thruogh matter or space |
medium | a substance through which a wave can travel |
outer ear | the part of the ear that acts as a funnel to direct sound waves into the middle ear, pinna collects sound waves |
middle ear | the part of the ear where the amplitude of a sound vibratinis increased, hammer anvil, and stirrup act as levers |
inner ear | movement of the liquid in the cochlea causes tiny hair cells to bend and stimulate nerves that send electrical signals to the brain for interpretation |
pitch | high or low a sound is percieved to be, depends on frequency |
infrasonic | frequencies of a sound that are lower than 20 Hz |
ultrasonic | frequencies of a sound that are higher than 20,000 Hz |
Doppler effect | the apparent change in the frequency of a sound caused by the motion of either the listener or the source of the sound |
loudness | how loud or soft a sound is percieved to be, depends on amplitude |
decibel | most common unit used to express loudness of a sound |
reflection | the bouncing back of a wave after it strikes a barrier |
echo | the bouncing back of a sound wave after it strikes a barrier, depends on how smooth and hard the surface is |
echolocation | the proces of using reflected sound waves to find objects |
interference | a wave interaction that occurs when two or more waves overlap, can increase or decrease the loudness of a sound |
sonic boom | the explosive sound heard when a shock wave from an object traveling faster thatn the speed of sound reaches a person's ears |
standing wave | a wave that forms a stationary pattern in which portions of the wave do not move and other portions move with a large amplitude |
resonance | frequency at which standing waves are made |
diffraction | bending of waves around barriers of through openings, depends on the wavelength and size of barrier or opening |
sound quality | the result of several pithes blending together through interference |
noise | any undesired, sound, especially nonmusical sound, that includes a random mix of pitches |
vibration | the complete back and forth motion of an object, cycle, includes both a compression and rarefaction |
tinnitus | hearing loss resulting from damage to the hair cells and nerve endings in the cochlea |
more dense | faster a sound wave moves |
more elastic | faster a sound wave moves |
higher temperature | higher it is the faster a sound wave moves |
hertz | the unit used to express frequency, one is equal to one cycle per second |
oscilloscoope | a device used to graph representations of sound waves |
sonar | type of ecolocation, sound navigation and ranging |
ultrasonography | a medical procedure that uses echos from ultrasonic waves to "see" inside a patient's body without perfoming surgery |
wind instruments | produces sound when a vibration is created at one end of an air column and creates a standing wave in it, woodwind, and brass, examples are french horn trombone, sax, and oboe |
percussion instruments | produce sound when struck, larger the insturment the lower the pitch, examples are drums, cymbol, and triangle |
string instruments | produce sound when their strings vibrate after being plucked or bowed, some examples are guitar, banjo, and violin |
compression | the region of higher density or pressure in a wave |
rarefaction | the region lower density or pressure in a wave |
longitudinal wave | a wave in which the particles of the medium vibrate back and forth along the path the wave travels |
mechanical wave | a wave that requires a medium in order to transfer energy |
fundamental | the lowest resonant frequency |
overtone | higher frequency than the fundamental |
refraction | the bending of a wave at it passes at an angle from one medium to another |