1.

The atomic mass number of Radium is `A=226`, its half life is `1622` years. What is the activity of `1g` Radium ?A. `3.6xx10^(10)Bq`B. `0.6xx10^(10)Bq`C. `1.6xx10^(10)Bq`D. `2.6xx10^(10)Bq`

Answer» Acitivity `=(dN)/(dt)=lambdaN`
`lambda=(0.693)/(t_(1//2))`
`N=` number of radium atoms


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