Monday
March 2, 2015

Homework Help: Physics

Posted by Beth on Saturday, October 11, 2008 at 10:12am.

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.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

calculus - Carbon-14 is a radioactive substance produced in the Earth's ...
Science - Radioactive substance decays so that after t years, the amount ...
Exponential decay - Show that if a radioactive substance has a half life of T, ...
Maths - A(t)=A'e^(-t/r) where A(t) is the amount after time t, A' is the initial...
Math - A radioactive substance decays according to the formula Q(t) = Q0e−...
Math - A radioactive substance decays according to the formula Q(t) = Q0e−...
Differential Equations - Model radioactive decay using the notation t = time (...
Math - Classify the model as exponential growth or exponential decay. Identify ...
Calculus-derivatives - Verify if these are correct answers. 1. The derivative of...
physics - A building has become accidentally contaminated with radioactivity. ...

Members