SAT Intensive Drill – Luyện Tập Nâng Cao Chuyên Sâu

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QUESTION BANK

The amount A of a isotope substance remaining t years after it was first measured is modeled by the equation below, where k is a constant rate of decay, and A0​ is the initial amount of the substance when t=0: A=A0ekt. If over time the substance decays at a fixed percent each year, which of the following must be true about the constant k?