If we start with 1.000 g of cobalt-60, 0.400 g will remain after 7.00 yr. This means that the half-life of cobalt-60 is ________ yr.

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Quizplus · Accepted Answer

The half-life can be calculated using the formula for exponential decay. If 0.400 g remains from an initial 1.000 g after 7 years, it means that the substance has gone through more than one half-life. Solving for the half-life using the decay formula, we find it to be approximately 5.30 years.

If We Start with 1