tic tac toe crossword

3. how many cycles in one second
6. one repetition of the motion
7. the phenomenon of increased amplitude that occurs when the frequency of an applied periodic force is equal or close to a natural frequency of the system on which it acts
9. are common and can range from the head on a bobble-head doll to water molecules that oscillate in a microwave oven.
10. at a speed of approximately 3.00 x 108 m/s or 186,000 miles/sec.
12. refers to various phenomena that occur when a wave encounters an obstacle or opening.
14. the maximum distance or angle the motion moves from its center position
17. the change in direction of a wave passing from one medium to another or from a gradual change in the medium
18. the shortest distance between two points that are “in phase”
19. time for one cycle
20. a disturbance that propagates through a material medium or space
21. the maximum displacement of a particle of the medium from the rest or equilibrium position

1. has a cycle that repeats. The electrocardiogram in the figure below shows a repeating cycle.
2. the speed of the wave
4. The displacement of the particles of the medium is perpendicular to the direction of wave propagation.
5. the change in frequency of a wave in relation to an observer who is moving relative to the wave source.
8. the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated
11. The displacement of the particles of the medium is parallel to the direction of wave propagation.
13. a phenomenon in which two waves combine by adding their displacement together at every single point in space and time, to form a resultant wave of greater, lower, or the same amplitude
15. energy is needed to create a disturbance in an elastic medium
16. travel through free