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Chapter2-Unit C
Question | Answer |
---|---|
sound | a wave that travels through matter, produced by a vibrating object |
ultrasound | sound waves in the range above 20,000 hertz |
amplification | the increasing of the strength of an electrical signal |
vibration | a rapid, back and forth motion |
decibel | the unit that measures sound intensity |
resonance | the strengthening of a sound wave when it combines with an object's natural vibration |
acoustics | the scientific study of sound |
vacuum | an empty space with no or very few particles |
Doppler effect | the change in observed pitch that occurs when the source or the receiver of a sound is moving |
echolocation | sending out ultrasound waves and interpreting the returning sound |
pitch | the quality of the highness or lowness of a sound |
intensity | the amount of energy in a sound wave |
sonar | instruments that use echolation to location objects |
hertz | one complete wavelength per second, or the unit for measuring frequency |