Question: a) Choose the best answer from the bracket given for each of the statements below. The half-life of a radioactive substance is the time taken

a) Choose the best answer from the bracket given for each of the statements below. The half-life of a radioactive substance is the time taken for (half / one-fourth) of a given number of radioactive nuclei to decay. (1 mark) ii. Suppose the decay constant of radioactive substance A is twice the substance B and substance B has a half-life of 4 hours, the half-life of substance A is (2 hours / 8 hours). (1 mark) b) A uranium-238 nucleus, 29,U emit alpha decay to be Thorium-234, ,T (Given mass 29%U = 238.0289 u, mass234T "90Th = 234.043 u, and mass $He is 4.002602 u). Write the formula for this decay process. (1 mark) ii. Calculate the amount of energy released. (2 marks)

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