Answer:-
In chemistry, the half-life formula is used to determine how long it takes for half of a substance to decay or react. For first-order reactions, the formula is t?/? = 0.693 / k, where t?/? is the half-life and k is the rate constant. This formula means the half-life stays the same no matter how much of the substance you start with. It's especially useful in radioactive decay and drug metabolism. For zero or second-order reactions, the formula changes. Knowing the half-life helps scientists predict reaction times and understand how substances change over time in various processes.
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