Questions
A count rate meter shows a count of 240 per minute from a given radioactive source. One hour later the meter shows a count rate of 30 per minute. The half-life of the source is
detailed solution
Correct option is D
A=A012n⇒30=24012n⇒123=12n ⇒n=3 ∴tT1/2=3⇒T1/2=t3=13hr=20 min.Talk to our academic expert!
Similar Questions
The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then
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