The half-life of radioactive sample is 4 days. After 16 days how much quantity of matter remain unde

Question

The half-life of radioactive sample is 4 days. After 16 days how much quantity of matter remain undecayed?

Professor PC Thomas Classes · Answer

Number of half-lives $n = 16/4 = 4$. Remaining fraction = $(1/2)^4 = 1/16$.