How do you work out half-life in physics?

Simply, Half-life of a nuclide or a radioactive element is the time taken for an element to disintegrate or decay or to half of its original mass. How To Calculate Half-Life Let N be the size of the population of the radioactive atoms at a given time t, dN be the amount by which it decreases in time dt. The rate of change is given as ; Mathematically: dN/dt= -lamda X N Where, Lamda is the decay constant. Or T(1/2)=0.693/lamda Take note: I you are to find the half-life the decay constant(Lamda) will be given. And when you are to find the decay constant, half-life will be given. To find the decay constant you will use the parametric formula below; Lamda=(2.303/6)xlog(No/N) Where No is the original amount of the nuclide/radioactive element N is the final amount of the nuclide/radioactive element after decay/disintegration. Please feel free to ask me any of your questions for further clarifications and to enroll in the classes.