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Sebuah laboratorium memiliki  murni, yang memiliki...

Sebuah laboratorium memiliki begin mathsize 14px style 1 comma 43 space text μg  end text N presubscript 7 presuperscript 13 end style murni, yang memiliki waktu paro 10 menit (600 s). Berapa aktivitasnya setelah 1,0 jam?   

Jawaban:

begin mathsize 14px style N equals n cross times N subscript A space space space equals m over m subscript r cross times 6 comma 02 cross times 10 to the power of 23 space space space equals fraction numerator 1 comma 43 cross times 10 to the power of negative 6 end exponent over denominator 13 end fraction cross times 6 comma 02 cross times 10 to the power of 23 space space space equals 0 comma 11 cross times 10 to the power of negative 6 end exponent cross times 6 comma 02 cross times 10 to the power of 23 space space space equals 0 comma 6622 cross times 10 to the power of 17 space space space equals 6 comma 622 cross times 10 to the power of 16 end style

begin mathsize 14px style N equals N subscript 0 open parentheses 1 half close parentheses to the power of t over T end exponent space space space equals 6 comma 6 cross times 10 to the power of 16 open parentheses 1 half close parentheses to the power of 3600 over 600 end exponent space space space equals 6 comma 6 cross times 10 to the power of 16 open parentheses 1 half close parentheses to the power of 6 space space space equals fraction numerator 6 comma 6 cross times 10 to the power of 16 over denominator 64 end fraction space space space equals 0 comma 103 cross times 10 to the power of 16 space space space equals 1 comma 03 cross times 10 to the power of 16 end style  

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