2. CH 8-9 QUIZ

4. Troughs

5. Longitudinal Waves move the particles of the medium ______ to the direction in which the waves are traveling.

6. parallel

7. The maximum distance that the particles of a medium move from the rest position is the __________.

8. Amplitude

9. The distance between two crests of a transverse wave is the ________.

10. Wavelength

11. The bending of waves due to a change in speed is called _________. example: light through a lens

12. Refraction

13. The bending of waves around the edge of a barrier is known as ___________.

14. Diffraction

15. Waves combine to make a wave with a smaller amplitude in a process called _______.

16. Destructive Interference

17. Resonance occurs when vibrations traveling through an object match the object’s natural ___________?

18. Frequency

19. Waves produced in the crust by earthquakes are called __________.

20. Seismic Waves

21. _______ is a mixture of sound waves that sound pleasing.

23. List the basic groups of musical instruments.

24. Wind String Percussion

25. Sound waves with frequencies below the normal human range of hearing are called ______.

26. Infrasound INFRA …. BELOW

27. Above what dB level can sound damage the ears?

28. 100 dB or Greater

29. Doctors use _________ to make sonograms. (Hint: Very High Frequencies)

30. Ultrasound

31. Some bats use _________ to navigate? “Sound” is not specific enough.

32. Echolocation

33. The most common type of hearing loss is due to __________.

34. Aging …. Getting Older. Why?: Hair Cells in the Cochlea die.

35. _______ are the slower seismic waves during an earthquake.

36. Secondary OR S-Waves

37. Frequency is measured in units called ______.

38. Hertz OR Hz

39. The height of a tsunami is ____ over the open ocean, and gets _____ when it reaches the shore.

40. low or small and gets…. taller or larger

43. During a storm, do you first see lightning OR hear thunder ?

44. See lightning Light = 300,000,000 m/sec Sound = 343 m/sec Sound comes later.

46. List the 3 variables that affect the speed of sound.

47. Elasticity Temperature Density

48. __________, or sound level, is measured in units called Decibels.

49. Loudness

50. The ________ of a sound that you hear depends on the sound wave’s frequency.

51. Pitch

52. The changing pitch of an approaching fire truck siren is an example of ___________.

53. Doppler Effect

54. How do we change the pitch of our own voice?

55. Tighten or loosen our vocal chords.

56. Which part of your ear collects sound and directs it towards the ear drum?

57. Outer Ear OR Ear Canal

58. Which part of your ear converts mechanical vibrations into signals for your brain?

59. Cochlea OR Hair Cells

60. What concept does the most common sound effect on this slide show demonstrate?

61. The Doppler Effect

62. 1. Complete pages 313, 319, 328, 335 2. Begin working on your study guide.