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Hii
you are welcome in my ans
since
No = 8000
T1/2 = 3s
so
lamda = 0.6931/3 = 0.231s^-1
2) Tav = 1/ lamda = 1/0.231 = 4.33s
N = 1000
(N/No) = (1/2)^n
n = 3
t1 = 3*3 = 9s
(dn/dt)= lamda * N = 0.231 *1000=231s^-1
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Hope it may helps you ✊✌️✊
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