The half life of radium is 1600 years. The fraction of a sample of radium that would remain after 64

Question

The half life of radium is 1600 years. The fraction of a sample of radium that would remain after 6400 years

Professor PC Thomas Classes · Answer

Number of half-lives $n = 6400 / 1600 = 4$. Fraction $= (1/2)^4 = 1/16$.