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    Any know how to tell if a graph has Exponential Decay?

    As title really, how do you know if a graph/chart has exponential decay?

    How do you work this out?

    10 Comments

    Plot it on log graph paper and it should be a straight line

    Original Poster

    The way i read it is that the drop in results against the increase of X makes it exponential decay?

    Or am i missing the point.


    hughwp

    Plot it on log graph paper and it should be a straight line



    What happens if the results decay slightly when on log paper? (which they do)


    choc1969

    http://serc.carleton.edu/introgeo/teachingwdata/Graphsexponential.html



    Thanks, have checked out that site and no wiser lol

    Edited by: "mds1256" 16th Apr 2011

    If the quantity decreases by one half in a characteristic time, then you will get a graph that curves down rapidly to begin with and then tails off.
    I will look for an example.

    like this:
    graph
    Edited by: "chesso" 16th Apr 2011

    Original Poster

    When you say will form a straight line does that mean a straight line or.a straight diagonal line?

    mds1256

    When you say will form a straight line does that mean a straight line … When you say will form a straight line does that mean a straight line or.a straight diagonal line?



    no, it will be a curved line as per the graphical evidence above ^^^^^

    In exponential decay, the rate of change decreases over time - the rate … In exponential decay, the rate of change decreases over time - the rate of the decay becomes slower as time passes. Since the rate of change is not constant (the same) across the entire graph, these functions are not straight lines.

    http://regentsprep.org/REgents/math/ALGEBRA/AE7/fixpic1.gif

    Original Poster

    That's great thanks!
    Edited by: "mds1256" 16th Apr 2011

    mds1256

    When you say will form a straight line does that mean a straight line … When you say will form a straight line does that mean a straight line or.a straight diagonal line?


    If will be a sloped line but depends on base of logs most people will assume natural logs (2.7 odd) as it's whats mostly found in science.

    Banned

    Answered and closed at OP request

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