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Get 101 Hikes in Southern California: Exploring Mountains, PDF

By Jerry Schad, David Money Harris

ISBN-10: 0899977170

ISBN-13: 9780899977171

Trek the various terrain of Southern California, from barren region to seashore to mountaintop, on a simple walk or in a single day event, with this final consultant to the one zero one top hikes within the Southland. Covers the Santa Monica, San Gabriel, San Jacinto, and San Bernardino mountains, and the Mojave and Colorado deserts. This up to date and revised variation of 1 of our best-selling guidebooks comprises 12 new hikes and up-to-date details for hikes from the former variation. All journeys were rehiked for this replace. each one journey features a map, photographs, path highlights, and emblems to inform you the fundamentals of the go to vacation at a look. each one map now comprises key GPS coordinates.

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Additional info for 101 Hikes in Southern California: Exploring Mountains, Seashore, and Desert (3rd edition)

Example text

These prefixes are nothing more than Greek names for the powers exponents of 10. SOUND LEVELS AND THE DECIBEL 31 Table 2-3. Reference quantities in common use. Level in decibels Reference quantity Acoustic Sound pressure level in air (SPL, dB) Power level (Lp,dB) 20 micropascal 1 picowatt(10–12 watt) Electric Power level re 1 mW Voltage level re 1 V Volume level, VU Acoustic Power 10–3 watt (1 milliwatt) 1 volt 10–3 watt Table 2-4. The Greeks had a word for it. It doesn’t take many watts of acoustic power to Prefix Symbol Multiple produce some very loud sounds, as anyone who tera T 1012 lives downstairs from a dedicated audiophile giga G 109 will testify.

Table 2-1. Ways of expressing numbers. 0001 1/10 10–1 1/(10 × 10) 10–2 1/(10 × 10 × 10) 10–3 1/(10 × 10 × 10 × 10) 10–4 25 26 CHAPTER TWO Table 2-1. Ways of expressing numbers (Continued). 75 100,000 100 2 3 4 Logarithms Representing 100 as 102 simply means that 10 × 10 = 100 and that 103 means 10 × 10 × 10 = 1,000. But how about 267? That is where logarithms come in. It is agreed that 100 equals 102. By definition you can say that the logarithm of 100 to the base 10 = 2, commonly written log10 100 = 2, or simply log 100 = 2, because common logarithms are to the base 10.

For example, acoustic intensity is acoustic power per unit area in a specified direction, hence Equation 2-2 is appropriate. Acoustic power is proportional to the square of the acoustic pressure, p, hence the power level is: p21 ᎏ Lp = 10 log 2 p2 p1 = 20 log ᎏ in decibels p2 (2-3) The tabulation of Table 2-2 will help you decide whether the Equation 2-2 or Equation 2-3 form applies. Table 2-2. Use of 10 log and 20 log. Parameter Acoustic Eq(2-2) a 10 log10 ᎏ1 a2 Power X Intensity X Eq(2-3) b 20 log10 ᎏ1 b2 Air particle velocity X Pressure X 27 28 CHAPTER TWO Table 2-2.

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101 Hikes in Southern California: Exploring Mountains, Seashore, and Desert (3rd edition) by Jerry Schad, David Money Harris

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