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

5y, 7m agoPosted 5 years, 7 months ago
As title really, how do you know if a graph/chart has exponential decay?

How do you work this out?
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5y, 7m agoPosted 5 years, 7 months ago
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#1
Plot it on log graph paper and it should be a straight line
#3
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)

Thanks, have checked out that site and no wiser lol

Edited By: mds1256 on Apr 16, 2011 14:22: spelling
1 Like #4
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 on Apr 16, 2011 14:09
#5
When you say will form a straight line does that mean a straight line or.a straight diagonal line?
1 Like #6
mds1256
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 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.
#7
#8
That's great thanks!

Edited By: mds1256 on Apr 16, 2011 20:47
#9
mds1256
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#10
Answered and closed at OP request