First slide

Radio activity

Question

${}^{210}{Bi}$ has half-life of 5 days. The time taken for seven-eighths of a sample of ${}^{210}{Bi}$ to decay is :

Easy

A

3.4 days
B

10 days
C

15 days
D

20 days

Solution

$\frac{7}{8} th decay means \frac{1}{8} th will be remains i . e . \frac{1}{2^{3}} is remain so it is 3 half life time . so 15 days .$

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