Question
Question: A radioactive material has an initial amount 16 gm. After 120 days it reduces to 1 gm, then the half...
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
Answer
30 days
Explanation
Solution
N0N=(21)n⇒(161)=(21)n⇒n=4
also n=T1/2t⇒T1/2=4120=306mudays