A 100 G Sample Of Of ${ }_{32}^{66} \mathrm{Ge}$

Multiple Choice

A 1.00 g sample of ${ }_{32}^{66} \mathrm{Ge}$ decays to 0.87 g in 1.9 hr.What is the half-life of ${ }_{32}^{66} \mathrm{Ge}$ ?

A) 0.073 hr
B) 0.11 hr
C) 4.5 hr
D) 9.5 hr
E) 14 hr