First slide

Radio activity

Question

In half-life of a radioactive element is 3 hours, after 9 hours its activity becomes

Easy

A

1/9
B

$\frac{1}{2}$
C

1/6
D

1/8

Solution

By using $A = A_{0} {(\frac{1}{2})}^{\frac{t}{T_{1 / 2}}} \Rightarrow \frac{A}{A_{0}} = {(\frac{1}{2})}^{9 / 3} = \frac{1}{8}$

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