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Class 12 NEET Physics Atoms and Nuclei Part 1
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© examsnet.com
Question : 10
Total: 100
The radius of germanium (Ge) nuclide is measured to be twice the radius of
4
9
B
e
. The number of nucleons in Ge are
(2006)
72
73
74
75
Validate
Solution:
Nuclear radii
R
=
R
0
(
A
)
1
∕
3
,
where
R
0
≈
1.2
f
m
or
R
∝
(
A
)
1
∕
3
∴
R
B
e
R
G
e
=
(
9
)
1
∕
3
(
A
)
1
∕
3
or,
R
B
e
2
R
B
e
=
(
9
)
1
∕
3
(
A
)
1
∕
3
(
∵
given
R
G
e
=
2
R
B
e
)
or,
(
A
)
1
∕
3
=
2
×
(
9
)
1
∕
3
or,
A
=
2
3
×
9
=
8
×
9
=
72
.
∴
The number of nucleons in Ge is 72 .
© examsnet.com
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