After 212 days the activity of a sample of an unknown type, Physics

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After 212 days the activity of a sample of an unknown type

Problem: After 2.12 days, the activity of a sample of an unknown type radioactive material has decreased to 84.6% of the initial activity.

Part A- What is the half-life of this material?

______ days

This is a physic problem, reply as soon as possible and please provide each step. Thanks.

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Physics: After 212 days the activity of a sample of an unknown type

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Physics: After 212 days the activity of a sample of an unknown type

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