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What is a decay curve as used in radioactivity?

Answer Text:
Decay curve
-A graph of activity against time is called decay curve.
-A decay curve can be used to determine the half-life period of an isotope since activity decrease at equal time interval to half the original

(i)From the graph show and determine the half-life period of the isotope.
From the graph t 1/2 changes in activity from: ( 100 – 50 ) => ( 20 – 0 ) = 20 minutes ( 50 – 25 ) => ( 40 – 20 ) = 20 minutes
Thus #t ^½# = 20 minutes.
(ii)Why does the graph tend to ‘O’?
Smaller particle/s will disintegrate /decay to half its original.
There can never be ‘O’/zero particles