Question : A radio -active substance has a half life of six months. Three-fourth of the substance will decay in ______.
Option 1: Six months
Option 2: Ten months
Option 3: twelve months
Option 4: Twenty four months
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Correct Answer: twelve months
Solution : The correct option is - twelve months
If the radioactive substance's half-life is six months, it means that in six months, 50% of the material will have decayed. Only 50% of the material is left when it decays. After another six months, the residual substance will decompose to half its original volume. Therefore, three-quarters of the material, or 75%, will degrade within a year .
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