Define decay constant and half life and state the relationship between the two
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Decay constant, proportionality between the size of a population of radioactive atoms and the rate at which the population decreases because of radioactive decay. A population decays exponentially at a rate that depends on the decay constant.
Half-life (symbol t1⁄2) is the time required for a quantity to reduce to half its initial value. The time required for half of the original population of radioactive atoms to decay is called the half-life.
The relationship between the half-life, T1/2, and the decay constant(λ) is given by T1/2 = 0.693/λ.
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