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     EduGorilla 
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    Originally, there were 1443 atoms of radioactive nuclide with some activity value . If after 20 minutes, the activity changed to 25 dpm, then find the value of initial activity .

    Options :-

    1. 20 dpm
    2. 50 dpm
    3. 30 dpm
    4. 66 dpm
    5. None of these
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