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18 terms

Science Virginia SOL 5.2 Sound

Some terms and definitions! :-)
STUDY
PLAY
crest
the highest point of a wave
communication tools
the various ways sound waves are used (musical instruments, voice, animal sounds, morse code, and telephone)
compression
where a sound wave pushes matter together
decibel
how the loudness of a sound is measured
Doppler Effect
change in the apparent frequency of a wave, because either the source of the wave is moving toward or away from the observer, or the observer is moving toward or away from the source of the wave (car blowing its horn as it passes by a person on the street)
echo location
animals such as bats and dolphins use this by bouncing sound off objects to determine distance
frequency
the number of vibrations in a given unit of time; how fast an object vibrates (measured in Hertz, Hz)
Morse Code
a series of long and short signals standing for letters of the alphabet that are sent over wires
pitch
how high or low a sound is determined by the frequency of a vibrating object (Objects vibrating faster have a higher pitch than objects vibrating slower. Larger objects vibrate more slowly and have lower pitch than smaller objects.)
rarefaction
where a sound spreads matter apart
resonance
the amplication of sound by increasing the force of its vibration (when a plucked guitar string causes the entire body of the guitar to move)
sonar
a device that reflects sound by sending out high frequency sound waves and recording the time it takes to return to the source
sound
a form of energy produced and transmitted by vibrating matter
trough
the lowest point of a wave
ultrasound
a device used by doctors to see inside the body by using sound waves to bounce off such things as bone, muscle, or organs
vibration
the rapid back and forth motion of an object
wave
a disturbance moving through a medium (solid, liquid, or gas)
wavelength
the distance between two compressions