The radioactive source in most smoke detectors is 241am, Physics

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The radioactive source in most smoke detectors is 241am

Solve the all parts of given question:

Question: The radioactive source in most smoke detectors is 241Am, which has a half-life of 432 years. Suppose only about 6.50×102 mg of this material is needed.

Part A: What is the initial source activity?

Part B: What would be the source's activity after 50 years in operation?

Part C: How many 241Am, nuclei would have decayed in this 50-year period?

I don't understand how to get the answer. Can you please help me with this question, Please help?

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Physics: The radioactive source in most smoke detectors is 241am

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