T 12 is the half-life t is the mean lifetime l is the decay constant. Learn the formula for half life as well as see an example in this free math video tutorial by Marios Math Tutoring009 Formula for Calculating Half Life03. Where D is the remaining substance after time t D 0 is the initial amount of the substance h is the half life of the substance and t is the elapsed time.
A 800 12 5.
The decay constant for a given element is determined experimentally by measuring the decay rate of the element. Half-life symbol t 12 is the time required for a quantity to reduce to half of its initial valueThe term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive. Geometric progression In geometric progression a1 7 q 5. Tfrac 1 2 t21.