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12. A beam of radioactive particles travels at a speed of 2.5 x 10:m/s. The half-life of the particles in the beam is measured to

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12. A beam of radioactive particles travels at a speed of 2.5 x 10:m/s. The half-life of the particles in the beam is measured to be 1.4us by an outside observer. Determine the half-life of those particles when they are at rest with respect to the observer. [2 marks] 13. Imaginary element Q has an atomic number of 129 and an atomic mass of 345. Complete the nuclear equation for element Q if it emits an alpha particle and daughter particle NQ. [3 marks] 14. Complete the following equation: 2399;Np - 2394 Pu + [2 marks]

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