After 2.20 days, the activity of a sample of an unknown type radioactive material has decreased to 77.4% of the initial

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answerhappygod
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After 2.20 days, the activity of a sample of an unknown type radioactive material has decreased to 77.4% of the initial

Post by answerhappygod »

After 2.20 days, the activity of a sample of an
unknown type radioactive material has decreased to 77.4% of
the initial activity. What is the half-life of this
material?
days
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