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1_nuclear - < Nuclear/AL91P2_1a 1(a The radioactive decay...

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<<< Nuclear/AL91P2_1a 1. (a) The radioactive decay of U 238 92 may be represented by β α + + Pb U 206 82 238 92 (i) State the nature of the α and β particles and compare their penetrating power. (ii) Balance the above equation. (iii) The age of a mineral containing U 238 92 and Pb 206 82 can be estimated from the mole ratio Pb 206 82 : U 238 92 . It is assumed that all Pb 206 82 has arisen only by the decay of the uranium and that all the subsequent decays are small in comparison with that of which has a half-life of 4.51 x 10 9 years. Calculate the age of the mineral if the mole ratio of Pb 206 82 : U 238 92 is 0.231 : 1.000. Note : The integrated form of a first order reaction may be expressed as kt I I o = ln where I o is the initial concentration and I is the concentration at time t. (9 marks) <<< nuclear/AL93P1_1a 1. (a) Name the particles X and Y in the following nuclear reactions, and give their charge and mass. Ra X Th 225 88 229 90 + Ac Y Ra 225 89 225 88 + Compare the action of a magnetic field upon the paths of X and Y. (4 marks) <<< nuclear/AL95P2_2a 2. (a) Ra 228 88 decays by the emission of β particles. The half-life for the decay is 6.67 years. (i)
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1_nuclear - < Nuclear/AL91P2_1a 1(a The radioactive decay...

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