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Previous Chapter

Applying the Concepts

Getting Ready for the Next Section

Beyond the Basics

77.
1. 26 dB; 18 dB; 12 dB; 6 dB
2. 200 ft
3. $a = 10 (4 + \log 4) \approx 46; b = - 20$ $a = 10 (4 + \log 4) \approx 46; b = - 20$
4. $r = \frac{200}{10^{L / 20}}$ $r = \frac{200}{10^{L / 20}}$
79. $5 \times 10^{15}$ $5 \times 10^{15}$ vs $2.5 \times 10^{16};$ $2.5 \times 10^{16};$ earthquake is 5 times more powerful.
81. [875, 885] Hz
83. $- 2.2$ $- 2.2$

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