If the half lives of a radioactive elements for α and β are 3 years and 6 years respectively, then percentage of the elements that remains after 10 years will be
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a
4.25 %
b
5.25%
c
3.12%
d
2.12%
answer is C.
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Detailed Solution
Effective half life =T1/2=t1t2t1+t2=6×36+3=2years For 10 years , n=tT1/2=102=5 half lives Decay Law, NNo=12n=132 ⇒NNo×100=132×100=3.125 %