Answer to Question #113412 in Physics for Xiomara

Question

How much of a 32 gram sample of I-131 remains after 48 days? (half-life of I-131 is 8 days)

Answer 1

$$m=m_02^{-\frac{t}{T}}$$

$$m=32\cdot2^{-\frac{48}{8}}=0.5\ g$$