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Question: The half-life of a radioactive substance against $\alpha$ -decay is $1.2 \times {10^7}s$. What is the decay rate for $4 \times {10^{15}}$ atoms of the substance

1) $4.6 \times {10^{12}}atoms/s$

2) $2.3 \times {10^{11}}atoms/s$

3) $4.6 \times {10^{10}}atoms/s$

4) $2.3 \times {10^8}$

Solution:

Explanation: No Explanation

Radioactivity Modern Physics

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