Answer :

Given, 6C decays to 5B.

(a) 116C 115B + β+


So, it is β+ decay.


(b) t1/2 = 20.3 min.


λ = min-1


Ci = 0.9C˳, Cf = 0.1C˳



So,



Taking loge both sides, we get




So,



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