First slide

Radio activity

Question

3.8 days is the half—life period of a Sample. After how many days, the sample will become l/8th of the original substance?

Easy

A

11.4
B

3.8
C

3
D

None of these

Solution

$\frac{N}{N_{0}} = {(\frac{1}{2})}^{n} \Rightarrow \frac{1}{8} = {(\frac{1}{2})}^{n} \Rightarrow n = 3 Now t = n x T_{1 / 2} = 3 x 3.8 = 11.4 days$

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