A radioactive sample is $\alpha$-emitter with half life $138.6$ days is observed by a student to have $2000$ disintegration/sec. The number of radioactive nuclei for given activity are
A radioactive sample is $\alpha$-emitter with half life $138.6$ days is observed by a student to have $2000$ disintegration/sec. The number of radioactive nuclei for given activity are
- A
$3.45 × 10^{10}$
- B
$1 ×10^{10}$
- C
$3.45 × 10^{15}$
- D
$2.75 × 10^{11}$
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- [JEE MAIN 2015]
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