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Q. The binding energy per nucleon for deuteron and helium are $ 1.1 $ MeV and $ 7.0 $ MeV. The energy released when two deuterons ruse to form a helium nucleus is:

KEAMKEAM 2006

Solution:

Ratio of n/p will decrease
$ {{2}_{1}}{{H}^{2}}{{\xrightarrow{{}}}_{2}}H{{e}^{4}}+Q $
Energy released
$ Q=4\times 7-4\times 1.1 $
$ =23.6MeV $