|| number of waves in an certain amount of time.
||Distance from the middle of the wave to the crest or trough
||Distance from crest to crest or trough to trough.
||The bending of a wave when it enters a new medium and changes speed.
||Bounce off a surface ,Hologram-to cal point
||A wave produced by the acceleration of an electric charge.
|waves carry _______________
|Medium particles_________to pass energy