Decay Constant Calculator

Enter the half-life into the calculator to determine the decay constant, also known as the decay rate.

Decay Constant Formula

The following formula is used to calculate the decay constant.

λ = ln (2) / t1/2

  • Where λ is the decay constant (s^-1)
  • Where t1/2 is the half-life (seconds)

FAQ

What is a decay constant?

A decay constant is the proportionality between the total size of a number and the rate of decay. This is most often used in physics when analyzing elements that undergo radioactive decay.


Decay Constant Example

How to calculate decay constant?

  1. First, determine the half life.

    The half life is the total time it takes for the population or amount to diminish to 1/2 it’s original size.

  2. Next, calculate the decay constant.

    Using the formula above, plug in the half life.


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decay constant formula

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