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Q.

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

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a

15 days

b

10 days

c

3.4 days

d

20 days

answer is C.

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Detailed Solution

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

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