copyright © 2005 pearson education, inc. slide 8-1
TRANSCRIPT
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Copyright © 2005 Pearson Education, Inc. Slide 8-1
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Copyright © 2005 Pearson Education, Inc.
Chapter 8
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Copyright © 2005 Pearson Education, Inc. Slide 8-3
Growth: Linear versus Exponential
8-A
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Copyright © 2005 Pearson Education, Inc. Slide 8-4
Growth: Linear versus Exponential
8-A
• Linear Growth occurs when a quantity grows by some fixed absolute amount in each unit of time.
• Exponential Growth occurs when a quantity grows by the same fixed relative amount—that is, by the same percentage—in each unit of time.
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Copyright © 2005 Pearson Education, Inc. Slide 8-5
Key Facts about Exponential Growth
8-A
• Exponential growth leads to repeated doublings. With each doubling, the amount of increase is approximately equal to the sum of all preceding doublings.
• Exponential growth cannot continue indefinitely. After only a relatively small number of doublings, exponentially growing quantities reach impossible proportions.
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• Doubling Time For a quantity growing exponentially at a rate of P% per time period, the doubling time is approximately
• Half-Life Period For a quantity decaying exponentially at a rate of P% per time period, the half-life is approximately
For both doubling and halving, this approximation works best for small growth rates and breaks down for growth rates over about 15%
Rule of 70 Approximations
8-B
PT 70 double
PT 70
life-half
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Copyright © 2005 Pearson Education, Inc. Slide 8-7
Exponential Growth vs. Decay
8-B
/1
new value = initial value x 2
half lifet T
/new value = initial value x 2 doublet T
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Copyright © 2005 Pearson Education, Inc. Slide 8-8
Exponential Growth(given that r > 0)
Exact Doubling Time and Half-Life Formulas
8-B
) + (1 log2 log double r
T
Exponential Decay(given that r < 0)
) + log(1(1/2) logor
) + (1 log2 log
half rrT
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Copyright © 2005 Pearson Education, Inc. Slide 8-9
Exponential versus Logistic Growth
8-C
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Copyright © 2005 Pearson Education, Inc. Slide 8-10
Overall Growth Rate and Logistic Growth Rate
8-C
Overall GrowthThe world population growth rate is the difference between the birth rate and the death rate:
growth rate = birth rate – death rate
Logistic GrowthThe logistic growth rate is dependent upon the ratio of current population to carrying capacity:
growth rate = base rate x (1 – population / carrying capacity)
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Copyright © 2005 Pearson Education, Inc. Slide 8-11
Overshoot and Collapse
8-C
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Difficulties of Population Prediction
8-C
The historical population of Egypt. SOURCE: T.H. Hollingsworth, Historical Demography (Ithaca, NY: Cornell University Press, 1969).
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Copyright © 2005 Pearson Education, Inc. Slide 8-13
Distribution of Earthquakes
8-D
The distribution of earthquakes around the world. Each dot represents an earthquake.
SOURCE: U.S. Geological Survey
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Copyright © 2005 Pearson Education, Inc. Slide 8-14
Measuring Sound
The decibel scale is used to compare the loudness of sounds.
The loudness of a sound in decibels is defined by the following equivalent formulas:
8-D
10
loudenss in dB
10
intensity of the soundloundness in dB = 10 log
intensity of the softest audible count
intensity of the sound10
intensity of the softest audible sound
or
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Copyright © 2005 Pearson Education, Inc. Slide 8-15
Typical Sounds in Decibels
8-D
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Copyright © 2005 Pearson Education, Inc. Slide 8-16
pH Scale
The pH scale is defined by the following equivalent formula:
pH = log10[H+] or [H+] = 10pH
where [H+] is the hydrogen ion concentration in moles per liter. Pure water is neutral and has a pH of 7. Acids have a pH lower than 7 and bases have a pH higher than 7.
8-D