Question

a) Starting with a parent nucleus A ZX, write down the four general reaction equations for α decay, β − decay, β + decay, and γ decay, respectively. In each case fully label the mass and atomic number of the reaction products. [4 marks] b) What is the half-life T1/2 of a substance, for which after 9 days 12.5 % of the initial parent nuclei are still present?

Answer 1