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Voca Chap. 21
science vocabualry
Question | Answer |
---|---|
pitch | a measure of how high or low a sound is perceived to be, depending on the frequency of the sound wave |
sonic boom | explosive sound heard when a shock wave from an object traveling faster than the speed of sound reaches a person's ear |
ultrasonic | frequency's that are above 20,000 Hz |
infrasonic | frequency's that are elow 20 Hz |
decibel | most common unit used to measure loudness |
loudness | extent to which a sound can be heard |
echo | reflected sound wave |
echolocation | process of using reflected sound waves to find objects |
Doppler Effect | observed change in the frequency of a wave when the source or observer is moving |
reflection | bouncing back of a ray of light, sound, or heat when the ray hits a surface that it does not go through |
diffraction | change in the direction of a wave when the wave finds an obstacle or an edge, such as an opening |
refraction | bending of a wave as the wave passes between two substances in which the speed of the wave differs |
interfernce | combination of two or more waves that results in a single wave |