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the radioactive isotope europium decays with a first order rate constant of 0.062 year-1. What fraction of the europium in a sample is still present 55.0 years later

Respuesta :

pstnonsonjoku

Answer:

0.033

Explanation:

From;

N/No = e^-kt

N/No = fraction of radioactive material left.

k= decay constant

t= time

N/No = e^-0.062 ×55

N/No = 0.033

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