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Since 1 u is equivalent to 931.494013 MeV,
∆
E
be
= (2.051245 u)(931.494013 MeV/u) = 1910.722 MeV.
Since there are 259 nucleons, the binding energy per nucleon is
∆
E
ben
=
E
/
A
= (1910.722 MeV)/259 = 7.38 MeV.
20. The binding energy is given by
( )
2
be
Rf
Hn
EZ
mA
Z
m
M
c
∆=
+−
−
⎡
⎤
⎣
⎦
,
where
Z
is the atomic number (number of protons),
A
is the mass number (number of
nucleons),
m
H
is the mass of a hydrogen atom,
m
n
is the mass of a neutron, and
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 Spring '08
 Any
 Physics, Energy, Mass, Neutron

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