You are using a geiger counter to measure the activity of a, Chemistry

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You are using a geiger counter to measure the activity of a

Question - Part A

You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 36.9minutes , what is the half-life of this substance?

Part B

An unknown radioactive substance has a half-life of 3.20hours . If 11.1g of the substance is currently present, what mass A0 was present 8.00 hours ago?

Express with the appropriate units.

Explicate the each step. Explicate the process and each step.

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Chemistry: You are using a geiger counter to measure the activity of a

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