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Across 5. The sharp crack heard when the shock wave that sweeps behind a supersonic aircraft reached the listener 9. The positions on a standing wave where the largest amplitudes occur 11. A "wiggle in space and time" 14. Wave in which parts of the wave remain staionary and the wave appears not to be traveling 18. One of the places in a wave where the wave is lowest or the disturbance is greatest in the opposite direction from a crest 20. A wave with vibration at right angles to the direction the wave is traveling 23. The time required for a pendulum to make one to and fro swing 25. One of the places in a wave where the wave is highest or the disturbance is greatest 26. Combination of waves where crest parts of one wave overlap trough parts of another, resluting in a wave of decreased amplitude 27. A wave in which the vibration is in the same direction as that in which the wave is traveling rather than at right angles

Down 1. Addition of two or more waves when wave crests overlap to produce a resulting wave on increased amplitude 2. Any part of a standing wave that remains staionary 3. A cone shaped wave produced by an object moving at supersonic speed through a fluid 4. The v shaped wave produced by an object moving on a liquid surface faster than the wave speed 6. The distance from the top of the crest of a wave to the top of the following crest 7. Periodic motion in which acceleration is proportional tot he distance from an equilibrium position and is directed toward that equilibrium position 8. Term applied to two or more waves whose crests arrive at a place a the same time 10. The SI unit of frequency 12. An increase in the measured frequency of light from an approaching source 13. A pattern formed by the overlapping of two or more waves that arrive in a region at the same time 15. Term applied to two waves for which the crest of one wave arrives at a point at the same time that a trough of the second wave arrives. 16. The change in frequency of a wave due to the motion of the source or of the reciever 17. An oscillation a repeating, back and forth motion 19. The distance from the midpoint to the maximum crest of a wave 21. A curve whose shaped represents the crests and troughs of a wave as traced out by a swinging pendulum that drops a trail of sand over a moving conveyor belt 22. A decrease in the measured frequency of light from a receding source 24. The number of events cycles or vibrations or any repeated event measured in hertz