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Half life of a radio active material

A radio active substance has a half life of 30 days. Calculate (a) the radioactive disintegration constant (b) The average life (c) the time taken for ¾ of the original number of atoms to disintegrate and (d) the time taken for 1/8 of the original number of atoms to remain unchanged

Nuclear physics

1. An alpha particle is fired at a sheet of gold with a kinetic energy of 4.62E-13 joules. Knowing that each gold nucleus has 79 protons, about how close will the alphas come to the nucleus? 2. If the binding-energy-per-nucleon for an alpha particle is 61.0 MeV, what is the total binding energy of the alpha? Give you answer