Question

The rest mass of the deuteron, ${}_{1}^{2}H$, is equivalent to an energy of 1876 MeV, the rest mass of a proton is equivalent to 939 MeV and that of a neutron to940 MeV. A deuteron may disintegrate to a proton and a neutron if it

• A. Emits a g-ray photon of energy 2 MeV
• B. Captures a g-ray photon of energy 2 MeV
• C. Emits a g-ray photon of energy 3 MeV
• D. Captures a g-ray photon of energy 3 MeV

Answer 1

Answer: (D)

Captures a g-ray photon of energy 3 MeV

Answer 2

$\left. \begin{array} { l l l } & { } _ { 1 } \mathrm { H } ^ { 2 } \longrightarrow & { } _ { 1 } \mathrm { H } ^ { 1 } + { } _ { 0 } \mathrm { n } ^ { 1 } \\ \text { E } & 1876 & 939 + 940 \\ & \mathrm { MeV } & \mathrm { MeV } \mathrm { MeV } \end{array} \right]$ energy is absorbed