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## Half-life

en.wikipedia.org/wiki/Half-life

... of the following three equivalent formulas: ... is the half-life of the decaying quantity, ...

## Exponentials & Logarithms - Cool math Algebra Help Lessons ...

... introduces radioactive decay and decibel levels and explains how to use their formulas. ... "Half-life means that, if you have 100 pounds of Plutonium-239.

## Half Life Calculator

www.calculator.net/half-life-calculator.html

Free online tool to calculate any one of the values from the other three in a half- life formula as well as to convert between half life, mean lifetime, and decay ...

## Some useful equations for half-lives | Nuffield Foundation

www.nuffieldfoundation.org/practical-physics/some-useful-equations-half-lives

This equation shows one of the properties of an exponential curve: the constant ratio ... A higher probability of decaying (bigger λ) will lead to a shorter half-life.

Jan 3, 2013 ... MATH VIDEO. How to calculate how much of a substance remains after a certain amount of time. ALSO: How to figure out how LONG it takes to ...

## ChemTeam: Half-Life

(1/2)number of half-lives equals the decimal amount remaining. Let us use several different half-lives to illustrate this equation. (1/2)<sup>0</sup> = 1. In this example, zero ...

## HALF-LIFE EQUATIONS

lpc1.clpccd.cc.ca.us/lpc/hanna/HistoricalGeology/HalfLifeEquations.pdf

Page 1. HALF-LIFE EQUATIONS. The basic equation ; the starting point ; : x. 2. 1 y = written for time: 1/2 t. 2. 1 y = where y = fraction of original material and. 1/2.

## Half Lives

www.chem.purdue.edu/gchelp/howtosolveit/Kinetics/Halflife.html

Equations for half lives; Determining a half life; Converting a half life to a rate ... Substitute this information into the equation for the half life of a reaction with this ...

## Doubling-Time & Half-Life

math.arizona.edu/~rwilliams/math112-spring2012/Notes/Doubling_Time_and_Half_Life.pdf

Doubling-Time & Half-Life. 1 Exponential Growth & Decay. Recall the formula we developed for compound interest,. A = P. (. 1 + r n. )nt. , where.

## How to Calculate Half Life: 6 Steps - wikiHow

www.wikihow.com/Calculate-Half-Life

You can calculate the half-life of any substance, given the rate of decay, which is the initial quantity of ... Now, we have the formula for the half-life of a substance.

hyperphysics.phy-astr.gsu.edu

The radioactive half-life for a given radioisotope is a measure of the tendency of the nucleus to "decay" or ... so the standard form of the decay equation is: ...

### Radioactive Half-Life Formula - Soft Schools

www.softschools.com

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay. For example, if the half-life of a 50.0 gram sample is 3 years, ...

### More Exponential Word Problems - Purplemath

www.purplemath.com

I can do this by working from the definition of "half-life": in the given amount of time (in this case, 9.45 ... Either way, I will end up dealing with this equation:.