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## Half-Life and Doubling Time

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**Half-Life**• Phenomenon is modeled by a decreasing exponential function (shows decay). • Half-life is the amount of time (length of the x-interval) over which the value of the phenomenon is cut in half.**Doubling Time**• Phenomenon is modeled by an increasing exponential function • Doubling time is the amount of time (length of the x-interval) over which the phenomenon doubles in size.**Carbon 14**Carbon 14 has a half-life of 5730 years.**`**The world population doubles every 51.8 years. At the beginning of the twentieth century, the world population was 1.6 billion. What was the population at the end of the twentieth century?**The world population doubles every 51.8 years. At the**beginning of the twentieth century, the world population was 1.6 billion. What was the population at the end of the twentieth century?