How much of the substance was present in the sample in the sample 20

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how much of the substance was present in the sample in the sample 20 hours before the sample was tested? the half life of a radioactive substance is 5 hours. a sample is tested and found to contain o.48g of the substance. this question is part of can you pass this IGCSE physics exam?

nataliemoyo223@gmail.com · Accepted Answer

How is it 1.92 when there are 4 half lives in 20hours therefore there was 7.68mg before the 20hours started

How much of the substance was present in the sample in the sample 20 hours before the sample was tested? The half-life of a Radioactive substance is 5 hours. A sample is tested and found to contain O.48g of the substance.

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