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Grade 12Modern Physics

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......

Profile image of vishwajit pureti
15 Years agoGrade 12
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1 Answer

Profile image of aman gupta
ApprovedApproved Tutor Answer15 Years ago

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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