NEET Physics Nuclei Questions Solved


10 gm of radioactive material of half-life 15 year is kept in store for 20 years. The disintegrated material is

(a) 12.5 g            (b) 10.5 g
(c) 6.03 g            (d) 4.03 g

(c) Remaining material  N=N02t/T
 N=10(2)20/15=102.15=3.96 gm
So decayed material =10-3.96 =6.04gm

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