Homework for Sound Unit

50 Points

13.3 Wave Motion

51-55, 57, 60, 61, 63, 64, 65, 67

13.4 Wave Properties

68, 69, 70, 72

13.5 Standing Waves and Resonance

73, 74, 76, 77, 79, 80, 81, 83, 87

74: Look at figure 19.20 on p. 442 and count the wavelengths

87: v = fl = Square root (F_T/m) where F_T = mass hung on the string * g. And m = mass of string/length

14.2 Sound Waves and the Speed of Sound

1-4, 6-8, 10-13, 17, 20, 21

3: Here’s another question for you: Does sound travel faster through DENSE steel or NOT VERY DENSE string?

14.4-14.5 Sound Phenomena and The Doppler Effect

48, 49, 50, 51, 54, 57, 59, 61, 67, 73

Answers: Chapter 13

52: a

54: If you don’t know, ask in class.

60: 1.7 cm to 17 m

64: a) 0.15 m b) 0.15 m/s

68: a) 0.20 sec b) 2.0 sec

70: only waveform; energy is not destroyed but redistributed. This is why sound quality goes down when there is destructive interference. Waveform is what determines sound quality.

72: If you don’t know, ask in class.

74: c (3/2l = 1.5l)

76: 5

80: a) yes b) no

Chapter 14:

2: a

4: d

6: Ask in class if you don’t know

8: ask in class if you don’t know

10: a) 337 m/s b) 343 m/s

12: a) 1.0 km b) 0.60 mi

20: 127 m

48: a

50: no

54: a) destructive b) constructive