Question

A radioactive substance has a half life of four months, three-fourth of the substance would decay in
A) 3 months
B) 4 months
C) 8 months
D) 12 months

Answer 1

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Answer 2

Let the Amount of Radioactive Substance at the Start be : R

Given : The Half Life of the Radioactive Substance is 4 Months

After 4 Months :

The Amount of Radioactive Substance would Decay by : $\{\frac{R}{2}\}$

After 8 Months :

The Amount of Radioactive Substance would Decay by : $\{\frac{R}{2} + \frac{R}{4}\}$

⇒ $\{\frac{R}{2} + \frac{R}{4}\} = \frac{3R}{4}$

Three - Fourth of the Radioactive Substance would decay in 8 Months

✿ Option C is the Answer ✿