1.

The half life period of a radioactive substance is 5.27 years (decay constant =2.5xx10^(-7)min""^(-1)). The decay activity of 2.0 g of the sample is about :

Answer»

`5XX10^(10)` dpm
`7.5xx10^(15)` dpm
`5xx10^(5)` dpm
`7.5xx10^(20)` dpm.

Solution :Decay ACTIVITY,
`-(dN)/(DT)=lamdaxxN`
`=2.5xx10^(-7)xx(2.0xx6.02xx10^(23))/(60)`
`=5.0xx10^(15)` dpm


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