A first order exponential decay can be written as

A(t)= Ae^(-t/r)
where A(t) is the amount (of substance) after time t, A is the initial amount at time t=0 and r is the decay time.

The fall time is defined as the time in which A(t) falls from 90% to 10% of its initial value. Find the relationship between the fall time of an exponential decay and r.

1 answer

I will start it off

.9=e^t1/r
ln .9 = t1/r
likewise..
ln .1=t2/r

tfall=t2-t1, well you do that...
Similar Questions
    1. answers icon 1 answer
    1. answers icon 3 answers
  1. Is the equation A=27500(0.75)ta model of exponential growth or exponential decay, and what is the rate of change per time
    1. answers icon 1 answer
  2. Is the equation A=27500(0.75)ta model of exponential growth or exponential decay, and what is the rate of change per time
    1. answers icon 1 answer
more similar questions