Physics

Problem

Let

N_\beta

be the number of

\beta

particles emitted by 1 gram of

\text{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): a.

6.2 \times 10^{21}

7.5 \times 10^{21}

1.25 \times 10^{22}

1.75 \times 10^{22}