Statement 1 : If the half life of a radioactive substance is 40 days then 25% substance decay in 20 days.Statement 2: N=N0(12)n, where n=time elapsedhalf life period

Half life of radioactive substance is 40 days. It means 50% substance decays in 40 days. During this period rate of decay is on decrease. So, 25% decay must have taken place is less than 20 days.N=N0(12)n, where n=time elapsedhalf life period