Nuclear Physics and RadioactivityHard
Question
The half life of a radioactive substance is 20 minutes. The approximate time interval (t2 - t1) between the time t2 when 
of it has decayed and time t1 and 
of it had decayed is :
of it has decayed and time t1 and of it had decayed is :Options
A.14 min
B.20 min
C.28 min
D.7 min
Solution
t1/2 = 20 minutes
N = N0e-λt2 λt1 ln 3
N0 = N0e-λt2 t1 = 
ln 3
N0 = N0e-λt2 t2 = ln 3
t2 - t1 =
= t2 - t1 =
= 20 min
N = N0e-λt2 λt1 ln 3
N0 = N0e-λt2 t1 = ln 3N0 = N0e-λt2 t2 = ln 3t2 - t1 =
= t2 - t1 =
= 20 min
Create a free account to view solution
View Solution FreeMore Nuclear Physics and Radioactivity Questions
The figure indicates energy level diagram of an atom and the origin of five spectral lines in emission spectra. Which of...At time t = 0, N1 nuclei of decay constant λ1 & N2 nuclei of decay constant λ2 are mixed. The decay rate of th...A nucleus has mass number $\alpha$ and radius $R_{\alpha}$. Another nucleus has mass number $\beta$ and radius $R_{\beta...Disintegration constant of a radioactive material is λ...zXM + 2He4 → 15P30 + 0n1...