A Radioactive Sample Has an Initial Activity of 2 $\times$ 10⁶ Cpm (Counts Per Minute),and After 4

question 40

Multiple Choice

A radioactive sample has an initial activity of 2.00 $\times$ 10⁶ cpm (counts per minute) ,and after 4.0 days,its activity is 9.0 $\times$ 10⁵ cpm.What is its activity after 29 days?

• A)8.7 cpm
• B)6.1 \(\times\) 10³ cpm
• C)3.3 \(\times\) 10² cpm
• D)1.5 \(\times\) 10^-9 cpm
• E)none of these

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