The half life of a radioactive substance against $\alpha - $ decay is $1.2 \times 10^7\, s$. What is the decay rate for $4.0 \times 10^{15}$ atoms of the substance
The half life of a radioactive substance against $\alpha - $ decay is $1.2 \times 10^7\, s$. What is the decay rate for $4.0 \times 10^{15}$ atoms of the substance
- [AIIMS 2010]
- A
$4.6 \times {10^{12}}\,atoms/s$
- B
$2.3 \times {10^{11}}\,atoms/s$
- C
$4.6 \times {10^{10}}\,atoms/s$
- D
$2.3 \times {10^{8}}\,atoms/s$
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