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sleet_krkn [62]
2 years ago
13

You have a meteorite sample and you decide to use the uranium-235/lead-207 system to date it. After analysis, you find that it h

as 22,500 atoms of 235U remaining, and 1,477,500 atoms of 207Pb that the 235U decayed to. What percentage of the original amount of 235U is still present?
Physics
1 answer:
storchak [24]2 years ago
5 0

Originally there must been

1,4775E6 + 2.25E4 = 147.75E4 + 2.25E4 = 150E4 present at start

% = 2.25 / 150 = 1.5 %      of 235 U left

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Explanation:

The complete question is given thus;

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from the given parameters we can solve this problem.

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q = (-0.3*10⁻⁶Tk * 4π * 0.07²) / (4π*10⁻⁷ * 280 ) = - [14.7 * 10⁻¹⁰k / 2.8 * 10⁻⁵ k ]

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