NEET Physics Nuclei Questions Solved


The half-life of Bi210 is 5 days. What time is taken by (7/8)th part of the sample to decay 
(a) 3.4 days               (b) 10 days
(c) 15 days                (d) 20 days

(c) By using N=N012t/T where N=1-78N0=18N0
So 18N0=N012t/T123=12t/5 t=15 days  

Difficulty Level:

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