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### 20 Cards in this Set

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 Medium the matter through which a wave travels Mechanical wave a wave that requires a medium through which to travel Electromagnetic wave a wave caused by a disturbance in electric and magnetic fields and that does not require a medium; also called a light wave Transverse wave a wave that causes the particles of the medium to vibrate perpendicularly to the direction the wave travels Longitudal wave a wave that causes the particles of the medium to vibrate paralles to the direction the wave travels Crest the highest point of a transverse wave Trough the lowest point of a transvers wave Amplitude the greatest distance that particles in a medium move from their normal position when a wave passes Wavelenght the distance between any two sucessive identical parts of a wave period the time required for one full wavelength to pass a certain point Fequency the number of vibrations that occur in a 1 s time interval Wave speed the speed at which a wave passes through a medium Doppler effect an observed change in the frequency of a wave when the source or observer is moving Reflection the bouncing back of a wave as it meets a surface or boundary Diffraction the bending of a wave as it passes an edge or an opening Refraction the bending of waves as the pass from one medium to another Interference the combination of two or more waves that exist in the same place at the same time Constructive Interference any interference in which waves combine so that the resulting wave is bigger that the original waves Destructive Interference any interference in which waves combine so that the resulting wave is smaller than the largest of the original waves Standing wave a wave form caused by interference that appears not to move along the medium and that shows some of the refions of no vibrations (nodes) and other regions of maximum vibration (antinodes)