1 answer

Several different radioisotopes can be used much like carbon-14 for determining the age of rocks and...

Question:

Several different radioisotopes can be used much like carbon-14 for determining the age of rocks and other matter. In the geosciences, the age of rocks may be determined using potassium-40, which decays to argon-40 with a half-life of 1.20 billion years.

1.) Some rocks brought back from the moon were dated as being 3.60 billion years old. What percentage of the potassium-40 has decayed after that time?

Express your answer with the appropriate units.

2.) Give a reason why uranium-238 (half-life of 4.6 billion years) is more useful for confirming this age than is carbon-14.


Answers

. halt lite time = 1.20 billion yes. No. of half lives = 3.60 = 3. 1.20 ) 2 Amt remaining atter a half lives = 1 ) = 1 Alemna

.

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