In a radioactive sample 
nuclei either decay into stable 
nuclei with decay constant 4.5 x 10 -10 per year or into stable 
nuclei with decay constant 0.5x10 -10 per year. Given that in this sample all the stable 
and 
nuclei are produced by the 
nuclei only. In time t x 10 9 years, if the ratio of the sum of stable 
and 
nuclei to the radioactive ^K nuclei is 99, the value oft will be
[Given : Inl0 = 2.3]
Text Solution
Verified by ExpertsC
So equivalent decay constant 
per year
and given that 
So t = 9.2x10 9 year
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