
A radionuclide decays via the chain,
where, the decay constants are . Calculate the alpha and beta-activities of the preparation of the mass a month after its manufacture.
Avogadro constant.
Important Questions on ATOMIC AND NUCLEAR PHYSICS
() How many alpha and decays does experience before turning finally into the stable isotope?

A stationary nucleus emits an alpha-particle with kinetic energy . Find the recoil velocity of the daughter nucleus. What fraction of the total energy liberated in this decay is accounted for by the recoil energy of the daughter nucleus?
mass of nucleons is .

Avogadro constant .




Evaluate the amount of heat produced during a day by active preparation of mass . The beta-particles are assumed to possess an average kinetic energy equal to of the highest possible energy of the given decay. The half-life of is hours.
Mass of is and of is , energy equivalent of neutrinos or electron is
and is equivalent to of energy, speed of light .

Taking the values of the atomic masses from the tables, calculate the kinetic energies of a positron and a neutrino emitted by nucleus for the case, when the daughter nucleus does not recoil.
Mass defect due to positron is , energy equivalent of neutrinos or electron is
and is equivalent to of energy, speed of light .
