Example 15.10: The activity of a radioactive sample decreased from 350 s- to 175 s" in one hour. Determine the half- life of the species.Example 15.11: In an alpha decay, the daughter nucleus produced is itself unstable and undergoes further decay. If the number of parent and daughter nuclei at time t are N and N respectively and their decay pconstants are 2 and 2, respectively. What condition needs to be satisfied in order for N, to remain constant? dExample 15.12: Calculate the energy released in the reaction 236 U - 1371 497 92 53 39 Y + 2n . The masses of 236 U 137 53 I and WY are 236.04557. 136.91787 and 96.91827 respectively.Example 15.13: Calculate the energy released in the fusion reaction taking place inside the Sun, 4 p -> a + 2et + neutrinos. neglecting the energy given to the neutrinos. Mass of alpha particle being 4.001506 u