Question

Radioactive element has a half life of one day. After three days the amount of the element left will be :

• A. 1/2 of the original amount
• B. 1/4 of the original amount
• C. 1/8 of the original amount
• D. 1/16 of the original amount

Answer 1

Answer: (C)

1/8 of the original amount

Answer 2

$C_{3} = \frac{C_{0}}{2^{3}} = \frac{C_{0}}{8}$

$\frac{C_{3}}{C_{0}} = \frac{1}{8}$