Sixteen Pounds of a Radioactive Substance Loses One Fourth of Its

Multiple Choice

Sixteen pounds of a radioactive substance loses one fourth of its original mass in 2 days. The mass m(t) remaining at time t is given by:

A) m(t) = 16 $e ^ { - 0.693t }$
B) m(t) = 16 $e ^ { 0.693t }$
C) m(t) = 4 $e ^ { - 0.693t }$
D) m(t) = 16 $e ^ { 0.144t }$