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WBJEE 2014 Chemistry Solved Paper
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© examsnet.com
Question : 50
Total: 60
A piece of wood from an archaeological sample has 5.0 counts
m
i
n
–
1
per gram of C-14, while a fresh sample of woodhas a count of 15.0
m
i
n
–
1
g
r
a
m
–
1
. If half life of C-14 is 5770 years, the age of the archaeological sample is
8500 years
9200 years
10000 years
11000 years
Validate
Solution:
0.693
t
1
2
t = 2.303 log
[
Activity
of
fresh
sample
]
[
Activity
of
fossil
]
,
0.693
5770
t = 2.303 log
15
5
⇒ t =
2.303
(
log
3
)
(
5770
)
0.693
years
= 92000 years (approx)
© examsnet.com
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