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### 31 Cards in this Set

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• Back
 Need a medium on which to travel Mechanical waves Particles of the medium vibrate perpendicular to the motion of waves (ie-plucked harp string) transverse waves Particles of the medium move parallel to the direction of the wave (ie- sound wave) longitudinal wave Combination of the two (ie- pebble dropped in water) Surface/water wave Doesn't need a medium, travels at the speed of light ina vacuum (ie- light...c- 10 x 10^8) electromagnetic waves solids which have wave properties (ie- electrons) matter waves sinlge bump or disturbance wave pulse wave whcih continues to move traveling wave time it takes for one complete vibration Period # of cycles per second frequency the distance during which motion repeats itself wavelength the top of the wave crest the botton of the wave trough the distance from the equilibrium position aplitude incoming wave that strike the boundary incident wave returning wave reflected wave upside down inverted if a wave travels from a more dense to a less dense medium the reflected wave is... upright/erect if a wave travels from a less dense to a more dense medium the reflected wave is inverted reflected sound waves echoes unit for loudness (volume) decibel pitches which sound unpleasant together dissonance pitches which sound pleasant together consonance ratio of frequencies is 1:2 octave apparent change in frequency due to motion; wavelength decreases, ,frequency increases doppler shift a pattern which results from the interference of 2 or more waves traveling in the same medium. Always characterized by an alternating patern of nodes and antinodes Standing wave result of the meeting of a crest with a trough. Leads toa point of no displacement. node postions along the medium where the particles oscillate about their equillibrium position with the max aplitude. Are resuklt of a crest meeting a crest and a trough meeting a trough. antinode the angles of incidence is equal to the angle of reflection law of reflection changing direction of the wave at the boundary between two different media refraction bending of waves around a barrier diffraction