X210 has half life of 5 days. The time taken for seven-eights of sampl

1.	X210 has half life of 5 days. The time taken for seven-eights of sample of X210 to decay is
A.	15 days
B.	20 days
C.	10 days
D.	none
Answer» B. 20 days

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X210 has half life of 5 days. The time taken for seven-eights of sample of X210 to decay is

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