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12. A beam of radioactive particles travels at a speed of 2.5 x 108 m/s. The half-life of the particles in the beam is measured

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12. A beam of radioactive particles travels at a speed of 2.5 x 108 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]

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