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# The average banana contains 0.436 g of potassium, and 0.012% of naturally occurring potassium is 40K,...

The average banana contains 0.436 g of potassium, and 0.012% of naturally occurring potassium is 40K, which has a half-life of 1.248 × 10^9 years and an atomic mass of 39.964 u. What is the activity of a freshly picked bunch containing three bananas?

The activity is the number of 40K decays that occur per unit time. Activity is commonly measured in units of Becquerel (Bq), which is defined as decays per second. Recall that the atomic mass unit u = 1.66 × 10^-24 g.

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