1.

Starting with a sample of pure .^(66)Cu, 1/8 of it decaysinto Zn in 15 minutes. The corresponding half life is

Answer»

`(7)1/2` minutes
5 minutes
15 minutes
10 minutes

Solution :` N/N_(0) = (1/2)^(n) = (1/2)^(t//t_(1)//2)`
`1/8 = (1/3)^(3) = (1/2)^(15//t_(1)//2)therefore15/(T_(1//2)) =3 or T_(1//2) = 5` minutes


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