NEET Physics Nuclei Questions Solved

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A radioactive material has an initial amount 16 gm. After 120 days it reduces to 1 gm, then the half-life of radioactive material is 
(a) 60 days              (b) 30 days
(c) 40 days              (d) 240 days

(b) NN0=12n116=12nn=4

also n=tT1/2T1/2=1204=30 days

Difficulty Level:

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