By definition 'half time' is the time in which a mass of material subject to decay [Uranium for example...] is halved. The decay law is then...
... where is the 'half time' and the mass of material at the time ...
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Recall that where (interchangeable with ) is the half life, and is the decay constant. Thus,
Now that we have , we can set up our equation.If you have 35 grams of uranium-232 to begin with, the equation that describes the radioactive decay is
Help please!
The decay equation has the form , where is the initial amount of the substance.
Thus, our decay equation is