NEET Physics Nuclei Questions Solved


The half-life of radon is 3.8 days. Three forth of a radon sample decay in
(a) 5.02 days         (b) 15.2 days
(c) 7.6 days           (d) 11.4 days

(c) Decayed fraction = 34 , so undecayed fraction = 14

Now NN0=12n14=12nn=2

t=n×T1/2=2×3.8=7.6 days

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