79. The half-life of 239 Pu has been determined by immersing a sphere of 239 Pu of mass 120.1 gm in.

79. The half-life of 239Pu has been determined by immersing a sphere of 239Pu of mass 120.1 gm in liquid nitrogen of a volume enough to stop all _-particles and measuring the rate of evaporation of the liquid. The evaporation rate corresponded to a power of 0.231 W. Calculate, to the nearest hundred years, the half-life of  239Pu, given that the energy of its decay alpha-particles is 5.144 MeV. (Take into account the recoil energy of the
View complete question »                          79. The half-life of 239Pu has been determined by immersing a sphere of 239Pu of mass 120.1 gm in liquid nitrogen of a volume enough to stop all _-particles and measuring the rate of evaporation of the liquid. The evaporation rate corresponded to a power of 0.231 W. Calculate, to the nearest hundred years, the half-life of  239Pu, given that the energy of its decay alpha-particles is 5.144 MeV. (Take into account the recoil energy of the product nucleus.) Given conversion factors: 1 MeV= 1.60206 × 10-13  joule , 1 atomic mass unit = 1.66 × 10-24  gm.    

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