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Glow-in-the-dark signs take advantage of β⁻ particles emitted in the decay of certain isotopes that glow when interacting with matter. If such a sign has an activity of 14.7 Ci when it's manufactured and contain isotopes with a half-life of 13.3 y, what will its activity in Ci be 3.9 y later?

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Glow-in-the-dark signs take advantage of β− particles emitted in the decay of certain isotopes that glow when interacting with matter. If such a sign has an activity of 14.7 Ci when it's manufactured and contain isotopes with a half-life of 13.3 y, what will its activity in Ci be 3.9 y later?