The radionuclides `.^(209)At` and `.^(209)Po` emit alpha particles with energies of 5.65 and 4.88MeV. Respectively. Which nuclide has the longer half life?

The binding energies of deutron (._1H^2) and alpha -particle (._2He^4) are 1.25 and 7.2 MeV/nucleon respectively. Which nucleus is more stable?

Staements I: In alpha decay of different radioactive nuclides, the energy of alpha particles has been compared. It is found that as the energy of alpha particle increases the half-life of the decay goes on decreasing. Staements II: More is the energy in any decay process, more is the probability of decaying the nuclide which leads to faster rate of decay.

A stationary ._(82)^(200)Pb nucleus emits an alpha -particle with kinetic energy T_(alpha) = 5.77 MeV . Find the recoil velocity of a daughter nucleus. What fraction of the total energy liberated in this decay is accounted for by the recoil energy of daughter nucleus ?

The alpha- decay of .^(210)Po nuclei (in the ground state) is accompanied by emission of two groups of alpha- particles with kinetic energies 5.30 & 4.50 MeV. Following the emission of these particles the daughter nuclei are found in the ground & excited states. find the energy of gamma-quanta emtted by the excited nuclei.