Waves Crossword Puzzle

the high points on a wave are called _____
the low points on a wave are called_____
a line perpendicular to a surface
the number of vibrations an object makes in a unit of time
when the motion of the medium is at right angles to the direction in which a wave travels
a wave that appears to stay in one place
the apparent change in frequency of a wave due to the motion of the source or of the receiver
a thin beam of light
the return of a wave back into its original medium
the bending of a wave
the appearance of a distorted image
a pictorial representation of a wave
the bending of a wave other than reflection or refraction
having a single color of frequency
the unit of frequency
a material that selectively absorbs colored light
the time of a back-and-forth swing of a pendulum
a spectrum formed when sunlight is dispersed by water droplets in the atmosphere
the stationary points on a standing wave
the sharp crack heard when the shock wave that sweeps behind a supersonic aircraft reaches the listeners