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Modern Physics
A=λN=A0e−λtA = \lambda N = A_0 e^{-\lambda t}

The rate of radioactive decay, measured in becquerels (decays per second).

Variables

A
Activity
Bq
\lambda
Decay constant
s⁻¹
N
Number of nuclei
unitless
A_0
Initial activity
Bq

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Common questions

What is the Activity formula?

Activity is written A = λN = A₀ e⁻λt. The rate of radioactive decay, measured in becquerels (decays per second). It belongs to Modern Physics, under Nuclear Physics.

What are the units in A = λN = A₀ e⁻λt?

In SI units, A is activity, measured in Bq; \lambda is decay constant, measured in s⁻¹; N is number of nuclei (dimensionless); A_0 is initial activity, measured in Bq.