A pure radio chemical preparation was observed to disintegrate at the rate of 2140 counts minutes at 12 35 P M At 3 55 P M of

Question

A pure radio chemical preparation was observed to disintegrate at the rate of 2140 counts minutes at 12 35 P M At 3 55 P M of the same day the disintegration rate of the sample was only 535 count minutes What is the half life of the material

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