Q 1635112962.     Let `N_{\beta}` be the number of \beta particles emitted by `1` gram of `Na^{24}` radioactive nuclei (half life `=15` hrs) in `7.5` hours, `N_{\beta}` is close to (Avogadro number `=6.023\times 10^{23}` g /mole)

JEE 2015 Mains 11 April
A

`1.75\times 10^{22}`

B

`6.2\times 10^{21}`

C

`7.5\times 10^{21}`

D

`1.25\times 10^{22}`

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