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Cuntas vidas medias tendran que transcurrir para que una muestra de un istopo radiactivo disminuya de una actividad de 576 cpm a una actividad de

Cuntas vidas medias tendran que transcurrir para que una muestra de un istopo radiactivo disminuya de una actividad de 576 cpm a una actividad de 9 cpm?

Esta pregunta me sali mal en el examen, pero la profesora no mostr cmo obtuvo la respuesta, alguna ayuda?

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