The defining equation named for these things is conventionally written "u sub tt equals c times u sub xx". These things can be bounded by envelopes and may have distinct group and phase velocities. The behavior of these things at a barrier is characterized by transmission and reflection coefficients. When these things are spatially localized, they are called "packets". Those that propagate transversely may possess polarization. De Broglie showed that particles have properties of these things. For 10 points, name these things that are generically oscillatory motions, typically characterized by 
The defining equation named for these things is conventionally written "u sub tt equals c times u sub xx". These things can be bounded by envelopes and may have distinct group and phase velocities. The behavior of these things at a barrier is characterized by transmission and reflection coefficients. When these things are spatially localized, they are called "packets". Those that propagate transversely may possess polarization. De Broglie showed that particles have properties of these things. For 10 points, name these things that are generically oscillatory motions, typically characterized by an amplitude and a frequency.
The defining equation named for these things is conventionally written "u sub tt equals c times u sub xx".
waves [or waveforms; prompt on "oscillations" or word forms] 