The information that can be used to determined using half-life is age of material.
What information can be know about half-life?
Half-life is known to be the way that is often used to know the age of the any given material.
Note that radioactive materials are said to be used when something is said to be in the state of decay as they are losing their energy and thus half-life is often used to measure or know their age after a given amount of time.
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