Question

7. What is the energy released in this alpha decay reaction 90230Th → 88226Ra + 24He? (The atomic mass of 230Th is 230.033139 u and that of 226Ra is 226.025402 u). Answer in MeV

Answer 1

step;1

now we find the mass on the right side reaction

mass of Ra=226.025402

mass of He=4.002603

...........................................

total mass on right side M2=230.028005

step;2

now we find the left side mass

mass M1=230.033139 u

decreasing of mass =230.033139-230.028005

                              =0.005134u

the energy released E=0.005134*931.5

                                =4.782321 MeV