The half-life of Bi ^ 210 is 5 days. What time is taken by (7/8)^ th part of the sample to decay?

MHT CET Physics question

The half-life of is 5 days. What time is taken by part of the sample to decay?

Answer: (C)

If has decayed, remains, so 3 half-lives are needed,

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Question ID VK-084647