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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?
Asked by Cooldude, Last updated: Nov 04, 2019

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2 Answers

nataliemoyo

Nataliemoyo

Answered on Nov 04, 2019

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

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cooldude

Cooldude

Answered on Apr 04, 2019

1.92
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