A sample of a radioactive material falls to 30 % of its initial activity in 7 years

CHEMISTRY · Subjective · US High School · Chemistry · Atomic Structure & Nuclear · Atomic Structure & Nuclear

Problem

A sample of a radioactive material falls to 30\% of its initial activity in 7 years. Using

\ln 0.30 = -1.2040

, calculate the half-life of the material correct to one decimal place (years).