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Q.

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

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a

3.4 days

b

10 days

c

15 days

d

20 days

answer is C.

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Detailed Solution

78th decay means 18th will be remain i.e. 123 will remain  so it is 3 half life time. so 15 days .

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