Question

if 1200 atoms decay with a half life of 2 years, how many are remaining after 8 years.

Answer 1

$</p><p>[latex]P_2 = \frac{13.0 \;\text{psi} \times 15.0 \;\rule[0.5ex]{1.2em}{0.1ex}\hspace{-1.2em}\text{mL}}{7.5 \;\rule[0.5ex]{1.2em}{0.1ex}\hspace{-1.2em}\text{mL}} = 26 \;\text{psi}[/latex]</p><p></p><p>$