haleygreene4856 haleygreene4856

28-02-2024
Chemistry

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Potassium-40 decays to argon-40, with a half life of 1.3 billion years. If an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite?

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