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

(a) Number of half lives in two days four substance 1 and 2 respectively are n1=2×2412=4 and  n2=2×241.6=3
By using N=N012nN1N2=N01N02×12n112n2

=21×124123=11 

Difficulty Level:

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