Questions
A sample of 2 gm of Ac (227) with a half life of 21.8 years decay to Fe (223) by emitting particles. After what time does the activity reduces to 12.5% of the original activity?
detailed solution
Correct option is C
Activity , A=A02-n here n =tth ⇒12.5=1002n ⇒5103=12n ⇒n=3 ⇒tth=3 ⇒t=3×half life = 3×21.8 = 65.4 yearsTalk to our academic expert!
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Activity of a radioactive element decreased to one third of original activity
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