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svlad2 [7]
2 years ago
7

Why are isotopes with short half-lives not useful for dating very old rocks?

Chemistry
2 answers:
kherson [118]2 years ago
5 0

Answer:

D

Explanation:

Very old rocks would be been formed before said isotopes with short half-lives. We're thinking of a very long geological time. The original rock might be rock C, then years and years later rock Y would be measured. Y can't match C since there's too much unknowns in between.

erma4kov [3.2K]2 years ago
4 0

Answer:

The radioactive isotopes within these brains typically record the ages of the grains-not the time when the sedimentary rock was formed, making it difficult to date using radiometric dating. The half-life of U-235 is 704 million years.

Explanation:

hope this helps but if i'm wrong then i'm sorry..

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Here is the formula for density:
Density (D) = Mass (M) divided by Volume (V)

So you would do D = 6.147 divided by 9.3

As an as answer you would get: 0.6609677419g/cm^3

Additional information:

The formula for volume is:
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I hope this helps :)
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