What is meant by activity or decay rate? Give its unit.
Activity (R) or decay rate which is the number of nuclei decayed per second and it is denoted as
R = `|"dN"/"dt"|`
R = `|"dN"/"dt"|` = λN0e-λt
R = R0e-λt
The SI unit of activity R is Becquerel and one Becquerel (Bq) is equal to one decay per second. There is also another standard unit for the activity called Curie (Ci).
1 Curie = 1 Ci = 3.7 × 1010 decays per second
1 Ci = 3.7 × 1010 Bq
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