NEET Physics Nuclei Questions Solved


At any instant the ratio of the amount of radioactive substances is 2 : 1. If their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances 
(a) 1 : 1                 (b) 2 : 1
(c) 1 : 2                 (d) 1 : 4

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