The
β
−
β
activity of a sample of
C
O
2
C
prepared form a contemporary wood gave a count rate of
25.5
25.5
counts per minute
(
c
p
m
)
(
. The same of
C
O
2
C
form an ancient wooden statue gave a count rate of
20.5
c
p
m
20.5
, in the same counter condition. Calculate its age to the nearest 50 year taking
t
1
/
2
t
for
.
14
C
.
as 5770 year. What would be the expected count rate of an identical mass of
C
O
2
C
form a sample which is 4000 year old?
Select the correct answer from above options