Question 273: Atoms & Nuclei

Question

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 :
$\eqalign{
  & \left( i ight)\,\,\,\,\,\,\,\,\,\,A + B 	o C + \varepsilon \,\,\,\,\,\,\,\,\,\,\left( {ii} ight)\,\,\,\,\,\,\,\,\,\,C 	o A + B + \varepsilon \,\,\,\,\,\,\,\,\,\,  \cr 
  & \left( {iii} ight)\,\,\,\,\,\,D + E 	o F + \varepsilon \,\,\,\,\,\,\,\,\,\,\left( {iv} ight)\,\,\,\,\,\,\,\,\,F 	o D + E + \varepsilon ,\,\,\,\,\,\,\,\,\,\, \cr} $
where $\varepsilon $ is the energy released? In which reactions is $\varepsilon $ positive?
![](https://imagex.cdn.examgoal.net/Iwba6l7huXtb4cV9z/LjbrhivZwg4Vxj3pHwKoBBFazDUR1/d60QAsHPoqhtMpn2lMuSuk/image.png)

Accepted Answer

For $A + B 	o C + \varepsilon ,\,\,\varepsilon $ is positive. This is because ${E_b}$
for $C$ is greater than the ${E_b}$ for $A$ and $B$.
Again for $F 	o D + E + \varepsilon ,\varepsilon $ is positive. This is
because ${E_b}$ for $D$ and $E$ is greater than ${E_b}$ for $F.$

Answer

$(i)$ and $(iii)$

Answer

$(ii)$ and $(iv)$

Answer

$(ii)$ and $(iii)$

Answer

$(i)$ and $(iv)$

Atoms & Nuclei

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