In an experiment to determine the half-life of a radioisotope, the attached graph was obtained. From the graph, what was the background count rate? What was the initial count rate from the sample? From the graph, deduce the half-life of the radioisotope.

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In an experiment to determine the half-life of a radioisotope, the attached graph was obtained. From the graph, what was the background count rate? What was the initial count rate from the sample? From the graph, deduce the half-life of the radioisotope.

Physics
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Background count rate is the lowest value of the graph.
- where it levels out

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Thank you!
initial count rate is where the curve cuts the y axis.
Deducing the half-life is a bit tricky because its not easy to see the time when the graph is at the background rate. It looks like at 7 hours which would make the half-life 3.5 hours.
yw

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