macenzie26

07.10.2019 • 

Mathematics

Aliving specimen in equilibrium with the atmosphere contains one atom of 14c (half-life = 5730 yr) for every 7.7 ✕ 1011 stable carbon atoms. an archeological sample of wood (cellulose, c12h22o11) contains 22.2 mg of carbon. when the sample is placed inside a shielded beta counter with 88.0% counting efficiency, 811 counts are accumulated in one week. assuming that the cosmic-ray flux and the earth's atmosphere have not changed appreciably since the sample was formed, find the age of the sample.

Ответ:

EllaLovesAnime

07.04.2021

Mathematics

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Use the "distance formula" derived from the Pythagorean Theorem:

d^2=(x2-x1)^2+(y2-y1)^2

d^2=(5-1)^2+(0--8)^2

d^2=16+64

d^2=80

d=√80

d≈8.9 units (to the nearest tenth of a unit)

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