Q.
The above is a plot of binding energy per nucleon $E_{b},$$_{}$ against the nuclear mass $M;\ A,\ B,\ C,\ D,\ E,\ F$ correspond to different nuclei. Consider four reactions
$A + B\ \rightarrow \ C\ + \ \varepsilon$
$C\ \rightarrow \ A + B\ + \ \varepsilon$
$D + E \rightarrow \ F\ + \ \varepsilon$
$F\ \rightarrow \ D + E + \varepsilon$
where $\ \varepsilon$ is the energy released? In which reaction is $\ \varepsilon$ positive?
A) (i) and (iv)
B) (i) and (iii)
C) (ii) and (iv)
D) (ii) and (iii)
Explanation
(a) Energy $\varepsilon$ is related only when lighter nuclei fuse to form a heavier nucleus such as in reaction (i)
$\ \ \ \ \ \ \ \ \ \ \ \ A + B \rightarrow C\ + \varepsilon$
Again ,energy is released when a heavy nucleus splits into lighter nuclei as in(iv)
$\ \ \ \ \ F\ \rightarrow \ D\ + E\ + \ \varepsilon$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.