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Questions  

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

detailed solution

Correct option is B

NN0=12n⇒116=116=12n⇒n=4 also n=tT1/2⇒T1/2=1204=30 days

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