Q. The binding energies per nucleon of $Li^{7}$ and ${He}^{4}$ are 5.6 MeV and 7.06 MeV respectively, then the energy of the reaction $Li^{7} + p = 2\lbrack\ _{2}He^{4}\rbrack$ will be

A) 17.28 MeV
B) 39.2 MeV
C) 28.24 MeV
D) 1.46 MeV
Explanation

(a) The reaction is $\ _{3}Li^{7} +_{1}P^{1} \rightarrow 2\left( \ _{2}He^{4}) \right.\ $
$\therefore\ \ E_{p} = 2E\left( \ _{2}He^{4}) \right.\ E_{(Li)}$
$= 2(4 \times 7.06) - 7 \times 5.6$
$= 56.48 - 39.2 = 17.28\ MeV$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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