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19. Disintegration rate of a sample is 1010 per hour at 20 hrs from the start. It reduces to 6.3 x 10' per hour after

19. Disintegration rate of a sample is 1010 per hour at 20 hrs from the start. It reduces to 6.3 x 10' per hour after 30 hours. Calculate its half life and the initial number of radioactive atoms in the sample

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