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### 24 Cards in this Set

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 Wave transfer energy, not matter; created by vibrations transverse the medium moves perpendicular to energy; radio, microwaves, infrared compressional (longitudinal) medium moves parallel to energy; earthquakes, SOUND Electromagnetic can travel through empty space; radio, micro, IR, visible light, UV, x-ray, Gamma Mechanical need a medium to travel through amplitude distance from normal resting position to the top of the crest or bottom of trough wavelength distance between successive parts of a wave; crest to crest or trough to trough crest top of the wave trough bottom of the wave node points along the medium which undergo vibrations between a large positive and negative displacement compression opposite of rarefaction rarefaction reduction of a medium's density frequency Hz=waves/second; as frequency increases, wavelength decreases pitch describes frequency of sound waves; human hearing= 20Hz-20000Hz loudness depends on amplitude; bigger amplitude, louder sound hertz unit for frequency; waves/second speed of sound 300 m/s speed of light 3 E 8 m/s destructive interference when the crest of one wave meets up with the trough of another they cancel each other out constructive interference when the crest of one wave meets up with the crest of another wave the amplitude of the resulting wave will be the sum of the two resonance occurs when the forced vibration is at an objects natural frequency (breaking a glass with a voice) beats created by constructive and destructive interferences; periods of sounds followed by soft sounds; when 2 waves of different frequencies interfere with one another Doppler effect relative motion creates a change in frequency when the object creating the sound and the observer are moving farther apart the pitch is lower, when the object creating the sound and the observer are moving closer together the pitch is higher sonic boom when the object creating a sound moves faster than the sound waves it's creating the compressions constructively interfere and create a "wall" of sound heard as a "boom" when the sound passes an observer