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# Unit 7 Lesson 3

### Waves- Important vocab to know from Unit 7 Lesson 3

TermDefinition
compression This is the spot on a longitudinal wave where the oscillators are squeezed together
rarefaction This is the spot on a longitudinal wave where the oscillators are spread apart
amplitude The maximum distance of the wave from the resting position. Standard unit for it is meters.
wavelength The length of one "cycle" of a wave. Standard unit for it is meters.
frequency The number of "cycles" or wavelengths that pass a fixed point in one second. Standard unit for it is Hz.
speed of a wave The distance that a wave travels in one second. Standard unit for it is m/s.
longitudinal wave In this type of wave, the oscillators that make up the wave move parallel to the direction that the wave travels.
transverse wave In this type of wave, the oscillators that make up the wave move perpendicular to the direction that the wave travels.
surface wave In this type of wave, the oscillators that make up the wave move in circular motion.This always occurs where two mediums meet.
oscillator This is one object moving in harmonic motion. Many of these close together make up a mechanical wave.
mechanical wave This type of wave requires a medium to move through, because it travels by sending a disturbance through oscillators.
electromagnetic wave This type of wave does NOT require a medium to move through.
medium This is the name for whatever substance a wave travels through.
wave This is a traveling disturbance that carries energy from one place to another.
crest This is what the peak of a transverse wave is called.
trough This is what the lowest point on a transverse wave is called.
Created by: davenportscience

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