Chapter 17
 8. (a) destructive interference (you must carefully show why)
    (b) constructive interference (you must carefully show why)
Chapter 24
 4. 3.62 to 5.45 pF
 6. 84.8 microV
24. 18.3 microJ
26. 602 W/m²
30. (a) 26.6 microN
    (b) 3.28 nN
32. (a) 640 Hz
    (b) f is higher for the returning wave
36. 206 W/m²
44. 48.3 microJ
46. (a) 1.09 MHz  (b) AM
52. 75.3 W
50. 720 W/m²
Chapter 25
 2. (a) 0.910 m
    (b) 0.850 m
 8. (a) 30° (b) 30°
Chapter 26
14. (a) 32.7° (b) 32.3°
26. 2.50 m
30. 1.35
44. (a) -11.9 cm  (b) 0.627   (c) virtual
    (d) upright   (e) reduced
46. -8.13 cm
48. (a) 204 cm    (b) real    (c) -17.1 cm
50. (a) 3.78 m    
    (b) width = 840 mm; height = 126 mm
56. 12.0 m
60. -5.60 cm
Chapter 27
24. 8 dark fringes
26. 12.0 mm
52. 6 bright fringes
Chapter 28
32. (0.920)c
34. (a) c     (b) (0.994)c
    (c) c     (d) (0.625)c  <== these posted answers are for
                                the EGrade version of this
                                problem with the book's numbers