UN Fisika 2016 Paket 3 Nomor 40

Perhatikan grafik peluruhan zat radioaktif berikut!

40

Aktivitas zat radioaktif setelah meluruh selama 13,86 jam adalah …

A.    0,693 {{N}_{o}}.ja{{m}^{-1}} D.    0,125 {{N}_{o}}.ja{{m}^{-1}}
B.     0,250 {{N}_{o}}.ja{{m}^{-1}} E.     0,025 {{N}_{o}}.ja{{m}^{-1}}
C.     0,139 {{N}_{o}}.ja{{m}^{-1}}

Penyelesaian

N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{t/{{T}_{\frac{1}{2}}}}}

N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{13,68/6,93}}

N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{2}}

N=\frac{1}{4}{{N}_{0}}~ja{{m}^{-1}}

Jawaban B

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