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Only 15 of the carbon-14 in a wooden bowl remains. How old is the b.pdf

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Mosquitoes are annoying insects. To eliminate mosquito larvae, a certain granular substance can be applied to standing water in a ratio of 1 tsp per 30 sq ft of standing water. At this rate, find how many teaspoons of granules used for 360 sq ft. If 3 tsp = 1 tbsp, how many tablespoons of be used? a. teaspoons of granules must be used. b. tablespoons of granules must be used. Solution To eliminate the mosquito larvae, we need 1 teaspoon for every 30 square-foot of standing water. For 360 sq ft we need 12 teaspoon s If 3 teaspoons = 1 tablespoon, then we need 4 tablespoons..

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Only 15% of the carbon-14 in a wooden bowl remains. How old is the bowl? (Carbon-14 has a half-life of 5,700 years. Round your answer to the nearest thousand years.) Solution Carbon-14 has a half-life of 5,700 years Decay constant = 0.693/half life = 0.693/5700 =0.00012157 N(t) = Noe^(-kt) = Noe^(-0.00012157t) Remaining 15% So, 0.15 No = Noe^(-0.00012157t) ln0.15 = -0.00012157t t =15.60 thousand yrs = 16 thousand years

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  • 1. Only 15% of the carbon-14 in a wooden bowl remains. How old is the bowl? (Carbon-14 has a half-life of 5,700 years. Round your answer to the nearest thousand years.) Solution Carbon-14 has a half-life of 5,700 years Decay constant = 0.693/half life = 0.693/5700 =0.00012157 N(t) = Noe^(-kt) = Noe^(-0.00012157t) Remaining 15% So, 0.15 No = Noe^(-0.00012157t) ln0.15 = -0.00012157t t =15.60 thousand yrs = 16 thousand years