NEET Physics Nuclei Questions Solved


Plutonium decays with a half-life of 24000 years. If the plutonium is stored for 72000 years, then the fraction of plutonium that remains is 
(a) 12           (b) 13
(c) 14           (d) 18

(d) n=7200024000=3; Now NN0=12n=18

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