Bananas are somewhat radioactive due to the presence of substantial amounts of potassium. Potassium-40 decays by two different paths: 40 K Ca+B (89.3%) 19 20 40 , K2 40 KA+B* (10.7%) 19 18 The half-life for potassium decay is 1.3x10° years. Calculate the overall and the rate constants for the individual branch reactions.

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