Any disturbance that transmits energy through matter or space.
wave
A substance that a wave travels through.
medium
A wave, such as sound, that requires a medium.
mechanical
A wave, such as light, that does not require a medium.
electromagnetic
A wave that moves a medium up and down.
transverse
Top of a transverse wave.
crest
Bottom of a transverse wave.
trough
A wave that moves the medium back and forth.
longitudinal
The crowded together particles in a longitudinal wave.
compression
The area in a longitudinal wave where the particles are spread out.
rarefaction
A wave that causes a circular pattern and happens where two media meet.
surface