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So we know that anything that is experiencing radioactive decay, it's experiencing exponential decay.
And we know that there's a generalized way to describe that.
It might be 1 gram, kilogram, 5 grams-- whatever it might be-- whatever we start with, we take e to the negative k times 1.25 billion years. So you get the natural log of 1/2-- we don't have that N0 there anymore-- is equal to the natural log of this thing.
decay or the rate of other cumulative changes in atoms resulting from radioactivity. The various isotopes of the same element differ in terms of atomic mass but have the same atomic number..
And we go into more depth and kind of prove it in other Khan Academy videos.
But we know that the amount as a function of time-- so if we say N is the amount of a radioactive sample we have at some time-- we know that's equal to the initial amount we have.
We'll call that N sub 0, times e to the negative kt-- where this constant is particular to that thing's half-life.
The geomagnetic polarity time scale was calibrated largely using K–Ar dating.
At present and without a suitable technique to address this problem, we are faced with a number of unanswered questions.