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JEEMAIN and NEET
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Physics
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Class12
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Q)
In an ore containing uranium , the ratio of
U
238
to
P
b
206
nuclei is
3
. Then calculate age of ore assuming that all lead present in ore is final stable products of
U
238
. Take half life if
U
238
to be
4.5
×
10
9
years
(
a
)
2.12
×
10
13
y
e
a
r
s
(
b
)
1.26
×
10
7
y
e
a
r
s
(
c
)
1.87
×
10
9
y
e
a
r
s
(
d
)
3.2
×
10
10
y
e
a
r
s
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