From the list of words above, choose the one that corresponds to the definitions below.

1. For a wave, the maximum displacement from the rest position of the medium to either the crest or trough.    _________________________

2. Location on a transverse wave where the wave the amplitude is greatest.      _________________________

3. The unit of measure for sound intensity, abbreviated dB.  _________________________

4. The bending of a wave around a barrier or through a narrow slit. _________________________

5. A material (solid, liquid, gas, or a combination of these) through which a wave travels.      _________________________

6. Occurs when a wave strikes an object and bounces off.  _________________________

7. A tiny particle-like bundle of radiation.    _________________________

8. Term that refers to how high or low sound frequencies of sound appear to be. _________________________

9. The bending of a wave caused by a change in speed as it travels from one medium into other.     _________________________

10. Phenomenon that occurs when the frequency of forced vibrations on an object matches the object’s natural frequency producing a dramatic increase in amplitude.      _________________________

11. The ability of two or more waves to combine and form a new wave. _________________________

12. A rhythmic disturbance that carries energy through matter or space. _________________________

13. The distance between identical points on two adjacent waves; for example, the distance between two crests or two troughs.  ____________

14. A repeating to-and-fro motion about an equilibrium position.  _____________________

15. A wave in which the medium is displaced perpendicular to the direction of wave itself.  This wave is described by appearance of crests and troughs as in a water wave.     _________________________

16. A wave in which the medium is displaced parallel to the direction of travel of the wave itself.  This wave is described in appearance by its compressions and rarefactions.     _________________________

17. The echoing effect produced by multiple reflections of sound.  _________________

18. The time required for one complete wave (crest to crest) to pass a fixed point.       _______________________

19. The number of waves that pass a fixed point in a given amount of time.       ________________________

20. The natural condition of the medium before and after a wave travels through it.       ______________________

21. A type of material that absorbs or reflects all light, and does not allow you to see through it.     ______________________

22. A type of material that allows lights to pass through it, and you can clearly see through it.     _____________________

23. A type of material that allows some light to pass through it, but you cannot see clearly through it.    ______________________

24. A material that absorbs specific colors and reflects others. It is defined by the colors it reflects. _________________________

25. Transverse waves that do not require a medium, and transfers energy by radiation.      _________________________

26. The unit of measure for frequency.     _________________________
 

27. The amount of energy in each wave; for sound waves, measured in decibels.      _________________________

28. The observed  increase or decrease in wave frequency, caused by motion of the sound source or receiver relative to each other. _________________________

29. Longitudinal waves caused by vibration of object. It is what you "hear".      _________________________

30. A multiple of the fundamental frequency of an object.    _________________________

31. The frequency at which an object naturally vibrates.     ______________________________

32. Common term for electromagnetic radiation.      _________________________

33. Part of a longitudinal wave in which the particles are spread apart. _________________________

34. Part of a longitudinal wave in which the particles are close together. _________________________

35. A mirror/lens where the surface curves outward.    ______________________________

36. A mirror/lens where the surface curves inward.    ____________________________

37. A three-dimensional image produced by laser light.   ____________________________

38. An image that appears to be behind the surface of a mirror.  ______________________________

39. An image that can be projected onto a screen.     _____________________________

40. The point where the optical axis intersects a curved mirror.  _________________________

41. An imaginary line that passes through the center of a curved mirror.  ______________________________

42. A piece of glass with a reflective coating on the front and/or the back.    _____________________________

43. A piece of transparent material that has two distinct surfaces, at least one is usually curved.      ____________________________

44. The point on the optical axis of a concave mirror or convex lens where light rays parallel to the optical axis come together.  __________________

45. An imaginary line drawn perpendicular to a reflecting surface or medium that light is entering.   _____________________

46. This is composed of all of the electromagnetic waves     ____________________________

47. Angle between a reflected ray and the normal to a surface.  ___________________________

48. Angle between the normal and the refracted ray after entering a different medium.    _____________________________

49. The ratio of the speed of light in a vacuum to the speed of light in a given material.     _____________________________

50. A point on the optical axis which represents the radius of a full circle drawn with respect to the apex of a curved mirror.     _____________________

51. Light with all waves vibrating in the same plane.   _____________________________

52. Coherent light of only one frequency. Light Amplification through the Stimulation of  Emitted Radiation    __________________

53. The center of a lens.       __________________________

54. An alternating loud-soft pattern heard due to the interference of sound waves of different frequency. _______________________