elastic		produced by a regularly repeated disturbance
perpendicular		infared radiation from the sun
amplitude		pebble dropped in a pond causes this
Hertz		The point of maximum positive displacement
energy		a cycle per second
pulse		if you halve the frequency, this happens to the period
parallel		wave in which the displacement of the medium is parallel to the propagation
propagates		the loudness of a soundwave is determined by this
crest		A wave moves, or ...., through a space
periodicwave		The direction of propagation to vibration in a transverse wave
longitudinal		the reduction in amplitude due to dissipation
inphase		particles that have the same displacement and are moving the same way
doubles		A single, nonrepeated disturbance
rarefaction		a medium that behaves as if it were an array of particles connected by springs
damping		All waves transport ......
electromagneticperiodic		An area where particles of matter are farther apart than at equilibrium
mechanicalpulse		The direction of propagation to vibration in a longitudinal wave