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Calculate time to disintegrate the sample

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Half-life of the isotope potassium -40 is 1.26 * 10^9 year. Calculate time to disintegrate the sample from an initial activity of 8.5 * 10^4 dpm to 7.4 * 10^3 dpm. Here, dpm is disintegrations per minute.

Reference no: EM131926085

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