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The activity of a sample of radioactive material is 'X' at time t and 'Y' at time 3t,If it's mean life is 'T' ,then.......
1) X = 3Y
2) X - Y = 2t
3) Y = X e^(-2t/T)
4) Y = X e^(-3t/T)
Pls explain......
mean life = 1/λ=T
activity= λn
i) X= λNe-λt
ii) Y=λNe-λ3t
divide (i)and (ii)
ans 3
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