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VITEEE 2011 Solved Paper
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© examsnet.com
Question : 24
Total: 120
What is the age of an ancient wooden piece if it is known that the specific activity of
C
14
nuclide in its amounts is 3/5 of that in freshly grown trees? Given the half of C nuclide is 5570 yr.
1000 yr
2000 yr
3000 yr
4000 yr
Validate
Solution:
Here,
N
0
=
3
5
N
0
e
−
λ
t
e
λ
t
=
5
3
∴ log
e
λ
t
=
l
o
g
e
5
3
or λt =
l
o
g
e
5
3
or t =
1
λ
l
o
g
e
5
3
=
T
0.693
× .5 [Since T = 0.693/λ]
=
5570
×
0.5
0.693
= 4000 yr
© examsnet.com
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