NEET Physics Nuclei Questions Solved


If half-life of a substance is 3.8 days and its quantity is 10.38 gm. Then substance quantity remaining left after 19 days will be 
(a) 0.151 gm             (b) 0.32 gm
(c) 1.51 gm               (d) 0.16 gm

(b) Number of half lives n=193.8=5; Now NN0=12n

N10.38=125N=10.38×125=0.32 gm

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