41. 7.4; basic
43.
7.1⋅10−4
6.3⋅10−8
1.7⋅10−8
10−3
45. 1.6⋅10−4; about 160 times more
47. pHA=pHB−2
49. pH decreased by log 50≈1.7; more acidic
51.
6.3⋅107I0
1.259⋅1016
53.
IA=10IB
EA=31.6EB
55. log 150≈2.18
57. ≈77 dB
59. ≈3.16⋅106 times as intense
61. 160 dB
63. I2≈1.26I1.
65. ≈4 cents more
67. ≈3.98⋅105
69. ≈1.58⋅109
71. ≈−5.4
73. y=25.72e0.511x
75. y=66.654−10.367 ln x
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