I know how to do half life problems and I even have a half-life calculator on my website:(adsbygoogle = window.adsbygoogle || []).push({});

http://www.1728.org/halflife.htm

However, I cannot calculate half-life when problems are stated in this form:

End Amt = Start Amt * e^-0.0391 * t (in years)

Half-life =?

I know calculus but I find it difficult understanding that kind of equation.

I believe the figure 0.0391 is the function "lambda".

So if lambda = .0391

then

half-life = ln(2) / lambda

half-life = 0.6931 / 0.0391

half-life = 17.73 years

Did I get that right?

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# End Amt =Start Amt *e^-0.0391 * t (in years) Half-life =?

Have something to add?

Draft saved
Draft deleted

Loading...

Similar Threads - =Start years Half | Date |
---|---|

New chemical created each year | Apr 24, 2017 |

Calculate The Distance Where Atoms Start to Repel Each other | Jul 19, 2015 |

Chemists learn more about how life started on earth? | Mar 18, 2015 |

Food Chemistry (where to start?) | Feb 25, 2013 |

Why does heat/spark start a combustion reaction? | Aug 5, 2010 |

**Physics Forums - The Fusion of Science and Community**