Question

What is the approximate energy released by the complete annihilation of an alpha particle?

• A. 931 J
• B. 372 J
• C. 931 Mev
• D. 3724 Mev

Answer 1

The correct option is D 3724 Mev

$\begin{array}{c}\text{we know, by Einstein Equation}\\ \text{Energy = m}\times c^2\end{array}$

$E=931.5Mev\text{in}1\text{amu}$

$\text{Now}\text{mass of}\alpha \text{-particle}=4\text{amu}$

$\begin{array}{cc}\text{Energy}& =4\times 931.5\text{Mev}\\ & =3126.0MeV\\ E& \approx 3724Mev\end{array}$