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Berapakah aktivitas satu gram , yang waktu paruhnya ?

Berapakah aktivitas satu gram begin mathsize 14px style Ra presubscript 88 presuperscript 256 end style , yang waktu paruhnya begin mathsize 14px style 1.622 space tahun end style

Jawaban:

begin mathsize 14px style N space equals space n space N subscript A space N space equals space fraction numerator m over denominator A r end fraction N subscript A end style 


begin mathsize 14px style lambda space equals fraction numerator space 0 comma 693 over denominator T end fraction space end style 

 

begin mathsize 14px style A equals lambda N A equals left parenthesis fraction numerator 0 comma 693 over denominator T end fraction right parenthesis space. space left parenthesis fraction numerator m over denominator A r end fraction space N subscript A right parenthesis A equals left parenthesis fraction numerator 0 comma 693 over denominator left parenthesis 1622 cross times 365 cross times 24 cross times 3600 right parenthesis end fraction right parenthesis space. space left parenthesis 1 over 236 space. space 6 comma 02 cross times 10 to the power of 23 right parenthesis A equals space 3 comma 612 cross times 10 to the power of 10 space end exponent disintegrasi divided by det end style 

 

Jadi, aktivitas radiasinya adalah A equals space 3 comma 612 cross times 10 to the power of 10 space end exponent disintegrasi divided by det

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