NEET Physics Nuclei Questions Solved

The half-life of At215 is 100 μs. The time taken for the radioactivity of a sample of At215 to decay to 1/16th of its initial value is 
(a) 400 μs               (b) 6.3 μs 
(c) 40 μs                 (d) 300 μs

(a) The radioactivity of a sample decays to 116th of its initial value in four half lives.

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