Question

The half-life period for a radioactive substance is $15$ minutes. How many grams of this radioactive substance is decayed from $50$ gram of substance after one hour?

• A. $37.5$
• B. $25$
• C. $43.75$
• D. $46.875$

Answer 1

Answer: (D)

$A_{0} \xrightarrow{15} \frac{ A _{0}}{2} \xrightarrow{30} \frac{ A _{0}}{4} \xrightarrow{45} \frac{ A _{0}}{8} \xrightarrow{60}\frac{A_{0}}{16}$
$3.125 \,g$ remain
Decayed $=46.875$