# Units 11 and 12 Review

Waves, Light and Sound

 Navigate to Answers for: [ Questions #1-#14 | Questions #15-#28 | Questions #29-#42 | Questions #43-#56 | Questions #57-#68 ] [ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

29. A wave whose speed in a spring is 4.4 m/s enters a second spring. The wavelength changes from 2.0 m to 3.0 m. The wave in the second spring travels at

 a. 1.46 m/s. b. 2.2 m/s. c. 2.9 m/s. d. 4.4 m/s. e. 6.6 m/s.

Boundary Behavior (14 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

30. The diagram 5-11 shows a portion of a rope in which a disturbance XY travels in the direction of the arrow. If the disturbance XY meets a similar disturbance traveling in the opposite direction, which one of the configurations of the rope, in diagram 5-20, could NOT appear?

 a. A b. B c. C d. D e. E

Boundary Behavior (14 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

31. A rope 2 m long is hanging vertically from a vibrator. It is noted that a single pulse travels to the end of the rope in 0.5 s. What frequency should be used in the vibrator to maintain three whole waves in the rope?

 a. 3/4 Hz b. 4/3 Hz c. 4 Hz d. 6 Hz e. 8 Hz

The Wave Equation (7 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

32. In an experiment to find the speed of waves in a rope, a standing wave pattern is established as shown in diagram 5-53. The vibrating end makes ninety vibrations per minute. The speed of the waves is

 a. 3 m/s. b. 6 m/s. c. 180 m/s. d. 360 m/s. e. 540 m/s.

The Wave Equation (7 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

33. Standing waves are produced in a string by two sources each having a frequency of 100 Hz. The distance from the 2nd node to the 5th node is 60 cm. The wavelength in centimeters of the original traveling wave is

 a. 50. b. 40. c. 30. d. 20. e. 15.

Mathematics of Standing Waves (2 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

34. Waves generated at A are reflected at B to produce a standing wave as shown in diagram 5- 56. The number of antinodes in the diagram is

 a. 3. b. 5. c. 6. d. 7. e. 12.

Nodes and Anti-nodes (8 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

35. The standing wave pattern in diagram 5-56 (above) is representative of the ____ harmonic.

 a. third b. fifth c. sixth d. seventh e. twelth

Harmonics and Patterns (2 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

36. The distance between successive nodes in a standing wave pattern is

 a. 1/4 wavelength. b. 1/2 wavelength. c. 3/4 wavelength. d. 1 wavelength. e. 2 wavelengths.

Nodes and Anti-nodes (8 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

37. A node is a point where there is always

 a. a double crest. b. a double trough. c. constructive interference. d. destructive interference. e. a double rarefaction.

Nodes and Anti-nodes (8 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

38. Constructive interference of waves occurs when two crests meet.

 a. True b. False

Interference of Waves (14 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

39. Which phenomemon is produced by two or more waves passing simultaneously through the same region?

 a. refraction. b. diffraction. c. interference. d. reflection.

Interference of Waves (14 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

40. Two pulses in a stretched spring approach P as shown in diagram 5-85. Which diagram in diagram 5-86 best illustrates the appearance of the spring when each pulse meets at P?

 a. 1 b.2 c.3 d.4

Interference of Waves (14 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

41. The diagram 5-81 illustrates

 a. interference. b. diffraction. c. the Doppler effect. d. polarization.

The Doppler Effect (7 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]

42. In diagram 5-81 (above), a person positioned at point A would perceive __________ frequency as the person positioned at point B.

 a. a higher b. a lower c. the sam

The Doppler Effect (7 seconds)

[ #29 | #30 | #31 | #32 | #33 | #34 | #35 | #36 | #37 | #38 | #39 | #40 | #41 | #42 ]