The half life of a radioactive sample undergoing $\alpha$ - decay is $1.4 \times 10^{17}$ s. If the number of nuclei in the sample is $2.0 \times 10^{21}$, the activity of the sample is nearly
The half life of a radioactive sample undergoing $\alpha$ - decay is $1.4 \times 10^{17}$ s. If the number of nuclei in the sample is $2.0 \times 10^{21}$, the activity of the sample is nearly
- [NEET 2020]
- A
$10^{3} \;Bq$
- B
$10^{4}\;Bq$
- C
$10^{5}\;Bq$
- D
$10^{6}\;Bq$
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- [JEE MAIN 2014]
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- [AIEEE 2005]
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- [JEE MAIN 2021]