periperishh Posted September 2, 2017 Report Share Posted September 2, 2017 Hi, i really need an example of maths ia on the topic of exponential decay/growth. i ve been stucked for a quite long time because i couldnt get any example of exponential. since most of the example focused on statistic. i really need one to make sure that im on a right track. Reply Link to post Share on other sites More sharing options...
Martijn.S Posted September 2, 2017 Report Share Posted September 2, 2017 Try having a look at radiative decay and half life. That is the most common exponential decay/growth that I know of. For growth, I'd say cell division (especially cancerous cells). There are a couple of good examples on Wikipedia, for both decay and growth: Growth: https://en.wikipedia.org/wiki/Exponential_growth#Examples Decay: https://en.wikipedia.org/wiki/Exponential_decay#Applications_and_examples Good luck. Reply Link to post Share on other sites More sharing options...
tim9800 Posted October 2, 2017 Report Share Posted October 2, 2017 As Martijn said above, radioactive decay is a great choice if you have some background in Physics - it will allow you to incorporate PE in your IA simply by saying "I was interested in the concept of radioactive decay in my physics class, but I wanted to develop it further mathematically". Another example I can think of, but for Chemistry is reaction rates. As the products of a reaction increase, but at a decreasing rate, the reactants decrease, also at a decreasing rate. Though I don't do HL, I have glimpsed over a few articles doing my Chemistry IA about orders of reaction, though I believe they are more to do with rational functions (hyperbolas) than exponential graphs. The pH scale is also a good go-to, as it uses a log base 10 scale. 1 Reply Link to post Share on other sites More sharing options...
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