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the various ways sound waves are used (musical instruments, voice, animal sounds, morse code, and telephone)
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)
animals such as bats and dolphins use this by bouncing sound off objects to determine distance
the number of vibrations in a given unit of time; how fast an object vibrates (measured in Hertz, Hz)
a series of long and short signals standing for letters of the alphabet that are sent over wires
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.)
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)
a device that reflects sound by sending out high frequency sound waves and recording the time it takes to return to the source
a device used by doctors to see inside the body by using sound waves to bounce off such things as bone, muscle, or organs
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