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

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