9. pH =8, base
11. pH ≈4.64, acid
13. [H+]=10−6, [OH−]=10−8
15. [H+]=3.16⋅10−10 [OH−]=3.16⋅10−5
17.
105I0
7.94⋅1011
19.
6.3⋅107I0
1.26⋅1016
21.
6;
106I0
23.
5.1
1.26⋅105I0
25. 40
27. 55.4
29. 10−4
31. 2.95⋅10−6
33. A#466 Hz, C523 Hz
35. ≈18 cents; noticeable
37. A is ≈2.5×106 times brighter than B.
39. B is ≈6.31 times brighter than A.
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