13.Nuclei
easy

જો ${ }_1^2 H ,{ }_2^4 He ,{ }_{26}^{56} Fe ,{ }_{92}^{235} U$ ની કુલ બંધન ઊર્જા અમુક્રમે $2.22,28.3,492$ અને $1786\,Mev$ છે. તેમાંથી સૌથી સ્થિર ન્યુક્લિઅસ ક્યુ હશે ?

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

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