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Hitunglah aktivitas inti atom 10 gram yang mempunyai waktu paruh !

Hitunglah aktivitas inti atom 10 gram begin mathsize 14px style U presubscript 92 presuperscript 238 end style yang mempunyai waktu paruh begin mathsize 14px style italic T equals 7 comma 07 cross times 10 to the power of 8 space s end style

Jawaban:

Diketahui :

begin mathsize 14px style italic m equals 10 space kg italic A italic r equals 238 italic t subscript begin inline style bevelled 1 half end style end subscript equals 7 comma 07 cross times 10 to the power of 8 space s end style 

 

Pembahasan :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row italic A equals cell italic lambda N end cell row blank equals cell fraction numerator italic l italic n open parentheses 2 close parentheses over denominator italic t subscript bevelled 1 half end subscript end fraction middle dot fraction numerator italic m N subscript italic a over denominator italic M italic r end fraction end cell row blank equals cell fraction numerator 0 comma 693 over denominator 7 comma 07 cross times 10 to the power of 8 end fraction middle dot fraction numerator left parenthesis 10 right parenthesis left parenthesis 6 comma 025 cross times 10 to the power of 23 right parenthesis over denominator 238 end fraction end cell row blank equals cell 2 comma 48 cross times 10 to the power of 13 space partikel forward slash s end cell row blank equals cell fraction numerator 2 comma 48 cross times 10 to the power of 13 over denominator 3 comma 7 cross times 10 to the power of 10 end fraction Ci end cell row blank equals cell 670 space Ci end cell end table end style 

Jadi, aktivitas inti atom 670 Ci

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