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Byju's Answer
Standard XII
Physics
Nuclear Radius
The stable nu...
Question
The stable nucleus that has a radius
1
/
3
that
O
s
189
is
A
3
L
i
7
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B
2
H
e
4
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C
5
B
10
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D
6
C
12
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Solution
The correct option is
A
3
L
i
7
We know that radius
R
=
1.2
×
10
−
15
A
1
/
3
m
, where
A
is mass number which is
189
for Os, suppose it is
A
1
for stable nuclei then
R
0
R
1
=
(
189
A
1
)
1
/
3
Given that
R
1
=
R
0
/
3
so we get
3
3
=
189
A
1
So
A
1
=
189
27
=
7
Option A is correct.
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