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9Sci CH18

9th Science CH18 Waves and Sound

acoustics the study of sound
amplitude in a wave, the distance from the rest position of the medium to either the crest or trough
compressional wave a type of wave where matter vibrates in the same direction as the wave travels
crest the highest point of a wave
frequency the number of wave crests that pass a point during one second; expressed in hertz (Hz)
intensity in sound waves, the amount of energy in each wave; the intensity level of a sound is measured in decibels (dB)
interference the ability of two or more waves to combine and form a new wave
loudness the human perception of sound intensity
medium a material (solid, liquid, gas, or a combination of these) through which a wave travels
music sound created using specific pitches, sound quality, and regular patterns
noise sound that has no regular pattern or definite pitch
pitch the highness or lowness of a sound, which is determined by the frequency of the sound waves
quality in sound, the differences among sounds of the same pitch and loudness
resonance the tendency of an object to vibrate at the same frequency as another vibrating source
reverberation the echoing effect produced by multiple reflections of sound
transverse wave a type of wave where the medium moves at right angles to the direction the wave is traveling
trough the lowest point of a wave
ultrasonic technology technology using high-frequency sound waves for many different purposes such as medical diagnoses, sonar, and jewelry cleaning
wave a rhythmic disturbance that carries energy through matter or space
wavelength the distance between identical points on two adjacent waves; for example, the distance between two crests or two troughs