After 2.08 days, the activity of a sample of an unknown type radioactive material has decreased to 78.6% of the initial
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After 2.08 days, the activity of a sample of an unknown type radioactive material has decreased to 78.6% of the initial
After 2.08 days, the activity of a sample of an unknown type radioactive material has decreased to 78.6% of the initial activity. What is the half-life of this material? days
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