The Half-Life of a Radioactive Material Is $4.5$ Days How Many Days Are Required for a Sample, with Many

question 65

Multiple Choice

The half-life of a radioactive material is $4.5$ days. How many days are required for a sample, with an initial activity of $1.0 \times 10 ^ { 5 } \mathrm {~Bq}$ , to decay to an activity of $100 \mathrm {~Bq}$ ?

• A) 45 days
• B) 54 days
• C) 31 days
• D) 36 days

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