21283Bi can disintegrate either by emitting an α-particle or by emitting a β--particle, (a) Write the two equations showing the products of the decays, (b) The probabilities of disintegration by α- and β-decays are in the ratio 7/13. The overall half-life of 212Bi is one hour. If 1 g of pure 212Bi is taken at 12.00 noon, what will be the composition of this sample at 1 p.m. the same day ?
