# Shared Flashcard Set

## Details

PS9 CH 14 Waves Terms
PS9 CH 14 Waves Terms
22
Science
04/29/2009

Term
 wave
Definition
 a periodic disturbance in a solid, liquid, or gas as energy is transmitted through a medium
Term
 medium
Definition
 a physical environment in which phenomena occur
Term
 mechanical wave
Definition
 a wave that requires a medium through which to travel
Term
 electromagnetic wave
Definition
 a wave that consists of oscillating electric and magnetic fields, which radiate outward at the speed of light
Term
 transverse wave
Definition
 a wave in which the particles of the medium move perpendicularly to the direction the wave is traveling
Term
 longitudinal wave
Definition
 a wave in which the particles of the medium vibrate parallel to the direction of wave motion
Term
 seismic waves
Definition
 a vibration in rock that travels out from the focus of an earthquake in all directions; seismic waves can also be caused by explosions
Term
 simple harmonic motion
Definition
 vibratory motion in a system in which the restoring force is proportional to the displacement from equilibrium.
Term
 damped harmonic motion
Definition
 a vibration that fades out as energy is transferred from on object to another
Term
 crest
Definition
 the highest point of a wave
Term
 trough
Definition
 the pushing or pulling force exerted by the engine of an aircraft or rocket
Term
 wavelength
Definition
 the distance from any point on a wave to an identical point on the next wave
Term
 period
Definition
 the time that it takes a complete cycle or wave oscillation to occur
Term
 frequency
Definition
 the number of cycles or vibrations per unit of time
Term
 Doppler effect
Definition
 an observed change in the frequency of a wave when the source or observer is moving
Term
 reflection
Definition
 the bouncing back of a ray of light, sound or heat when the ray hits a surface that it does not through
Term
 diffraction
Definition
 a change in the direction in the direction of wave when the wave finds an obstacle or an edge, such an opening
Term
 refraction
Definition
 the bending of a wavefront as the wavefront passes between two substances in which the speed of the wave differs
Term
 interference
Definition
 the combination of two or more waves of the same frequency that results in a single wave
Term
 constructive interference
Definition
 any interference in which waves combine so that the resulting wave is bigger that the original waves
Term
 destructive interference
Definition
 any interference in which waves combine so that the resulting waves is smaller than the largest of the original waves
Term
 standing wave
Definition
 a pattern of vibration that simulates a wave that is standing still
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