The half-life for decay of 14C by β-emission is 5730 year. The fraction of 14C decays, in a sample that is 22920 year old, would be:
1516
116
18
78
A
18
B
116
C
1516
D
78
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Solution
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Number of half life involved, n=totaltime(t)halftime(t1/2)=229205730=4
Left amount, N=N0(12)n
N=N0(12)4=N016
∴ Decayed fraction x=N0−N016
x=16N0−N016=15N016
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