A) You are using a Geiger counter to measure the activity of a radioactive substance over...

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A) You are using a Geiger counter to measure the activity of a radioactive substance over...

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 48.2 minutes , what is the half-life of this substance?

B) An unknown radioactive substance has a half-life of 3.20 hours . If 24.3 g of the substance is currently present, what mass A0 was present 8.00 hours ago?

C) Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 40.0 % of an Am-241 sample to decay?

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