Questions
The radioactivity of a given sample of whisky due to tritium was found to be only about 4% of that measured in a recently purchased bottle marked 7 years old. The sample must have been prepared about given log5=0.698
detailed solution
Correct option is C
Decay Law, A = Ao 2-tT1/2 ⇒AoA=2tT1/2 Taking log ⇒t ln2T1/2=lnAoA ⇒ln212.5=1tln1004 ⇒t =12.5 × ln25ln2=58 yearsTalk to our academic expert!
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In a radioactive material, fraction of active material remaining after time t is 9/16. The fraction that was remaining after t/2 is :
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