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3. the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave
5. repeats as a function of both time and position and can be described by its amplitude
7. is a type of energy made by vibration
10. abrupt change in the direction of propagation of a wave that strikes the boundary between different mediums
12. the change in direction of a wave passing from one medium to another caused by its change in speed
15. unit for expressing the ratio between two physical quantities,
16. The sensation of a frequency is commonly referred to as the pitch of a sound
17. the reduction of an item's density, the opposite of compression a force that squeezes something together
18. the Standard International ( SI ) unit of time

1. when one object vibrating at the same natural frequency of a second object forces that second object into vibration motion
2. the time required for one complete cycle of vibration to pass a given point
4. the SI unit of length or distance
6. equals the number of cycles per second
7. a vibration that propagates as an acoustic wave
8. the effect produced by a moving source of waves
9. electromagnetic radiations in which the direction and magnitude of the vibrating electric field are related in a specified way wavespeed is the speed at which a wave travels
11. electromagnetic radiation that can be detected by the human eye
13. the point on the medium that exhibits the maximum amount of positive or upward displacement from the rest position
14. attribute of a sound that determines the magnitude of the auditory sensation