The surface of the sun has dark areas known as sunspots,
Chapter , Problem 1.2.25(choose chapter or problem)
The surface of the sun has dark areas known as sunspots, that are cooler than the rest of the suns surface. The number of sunspots10 fluctuates with time, as shown in Figure 1.21. (a) Explain how you know the number of sunspots, , in year is a function of . (b) Approximate the time intervals on which is an increasing function of . 1960 1970 1980 1990 2000 2010 40 80 120 160 (year) (number of sunspots) Figure 1.21
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