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# Ch 15 Wavess

wave A disturbance that transfers energy from place to place
energy The ability to do work or cause change
medium The material through which a wave travels
mechanical wave A wave that requires a medium through which to travel
vibration A repeated back-and-forth or up-and-down motion
transverse wave A wave that moves the medium in a direction perpendicular to the direction in which the wave travels
crest The highest part of a transverse wave
trough The lowest part of a transverse wave
longitudinal wave A wave that moves a medium in a direction parallel to the direction in which the wave travels
compression The part of a longitudinal wave where the particles of the medium are close together
rarefaction The part of a longitudinal wave where the particles of the medium are far apart
amplitude The maximum distance the particles of a medium move away from their rest positions as a wave passes through the medium
wavelength The distance between two corresponding parts of a wave
frequency The number of complete waves that pass a given point in a certain amount of time
hertz Unit of measurement for frequency
reflection The bouncing back of an object or wave when it hits a surface through which it cannot pass
law of reflections The rule that the angle of reflections equals the angle of incidence
refraction the bending of waves as they enter a new medium at an angle diffraction
interference The interaction between waves that meet
constructive interference The interference that occurs when waves combine to make a wave with a larger amplitude
destructive interference the interference that occurs when two waves combine to make a smaller amplitude
standing wave A wave that appears to stand in one place
node A point of zero amplitude on a standing wave
antinode A point of maximum amplitude on a standing wave
resonance The increase in the amplitude of a vibration that occurs when external vibrations match an objectâ€™s natural frequency
seismic wave A wave produced by an earthquake
P wave A longitudinal seismic wave
S wave A transverse seismic wave
surface wave A combination of longitudinal wave and a transverse wave that travels along the surface of a medium
tsunami A huge surface wave on the ocean caused by an underwater earthquake
seismograph An instrument used to detect and measure earthquake waves
Created by: redzone31
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