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13.Nuclei
easy
If the total binding energies of ${ }_1^2 H ,{ }_2^4 He ,{ }_{26}^{56} Fe$ and ${ }_{92}^{235} U$ nucleiare $2.22,28.3,492$ and $1786 MeV$ respectively, identify the most stable nucleus of the following.
A
${ }_{26}^{56} Fe$
B
${ }_1^2 H$
C
${ }_{92}^{235} U$
D
${ }_2^4 He$
Solution
(a)
$B . E_H=\frac{2.22}{2}=1.11$
$\text { B. } E _{ He }=\frac{28.3}{4}=7.08$
$\text { B. } E _{ Fe }=\frac{492}{56}=8.78=\text { maximum }$
$\text { B. } E _{ U }=\frac{1786}{235}=7.6$
${ }_{26}^{56} Fe$ is most stable as it has maximum binding energy per nucleon.
Standard 12
Physics
