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Sound and Waves
6th Grade Science Quiz
Term | Definition |
---|---|
ultrasound | Sound waves in range above 20,000 hertz |
acoustics | The scientific study of sound |
frequency | The number of wavelengths passing a fixed point in a given period of time |
decibel | The unit that measures sound intensity |
sound | A wave that travels through matter produced by a vibrating object |
sonar | Instruments that use echolocation to locate objects. |
vacuum | An empty space with no or very few particles |
echolocation | Sending out ultrasound waves and interpreting their returning sound |
intensity | the amount of energy in a sound wave |
hertz | One complete wavelength per second or the unit of measuring frequency |
amplification | The increasing of the strength of an electrical signal |
pitch | The quality of the highness or lowness of a sound |
Doppler effect | The change in observed pitch that occurs when the source or the receiver of a sound is moving. |
resonance | The strengthening of a sound wave when it combines with an objects natural vibration |
vibration | A rapid back or forth motion |
vacuum | Which of these does not describe how sound can be heard? pitch, hertz, or vacuum |
Doppler effect | Which of these can be heard by humans? ultrasound, Doppler effect, or echolocation |
rarefaction | A low pressure area of loosely packed molecules |
echo | The reflection of sound waves off a hard surface can create this: |
sonar | What word is an abbreviation of sound navigation and ranging? |
refracting | When a wave changes direction as it passes from one substance to another it is ____. |