The half-life of \[B{{i}^{210}}\]is 5 days. What time is taken by (7/8 – McqOptions

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1.	The half-life of \[B{{i}^{210}}\]is 5 days. What time is taken by (7/8)th part of the sample to decay [MNR 1986; Pb. PMT 2001]
A.	3.4 days
B.	10 days
C.	15 days
D.	20 days
Answer» D. 20 days

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