Biology

Biology, 19.11.2019 16:31, kkmonsterhigh18

We start with 400 atoms of uranium-238. how many remain after 4.5 billion
after 9 billion years?
after 13.5 billion years?

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Physics, 26.07.2019 15:40, 20emmanuelg1030

Uranium-238 has a half-life of 4.5 billion years. if earth is about 4.5 billion years old, which statement is true? a. in about 4.5 billion years, there will be the same amount of uranium-238 as there is today. b. about 4.5 billion years ago, there was half as much uranium-238 as there is today. c. about 4.5 billion years ago, there was twice as much uranium-238 as there is today. hell mm

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Ameteorite was found to contain 40 argon-40 atoms for every 10 potassium-40 atoms. the half-life of postassium-40 is 1.25 billion years. assuming no loss of daughter isotopes, how old is the moon rock? 2.5 billion years old 3.75 billion years old 6.75 billion years old 10.5 billion years old

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Biology, 13.11.2019 16:31, boxergirl2161

1. we start with 400 atoms of uranium-238. how many remain after 4.5 billion years? after 9 billion years? after 13.5 billion years? 2 . how long will it take for ½ of the original amount of rubidium-87 to decay? 3. carbon-14 has a half-life of 5,730 years. how does that compare to those listed in the chart? what possible advantages or disadvantages would this give c-14 when used for radiometric dating?

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Geography, 06.12.2019 03:31, mixcolin0002

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We start with 400 atoms of uranium-238. how many remain after 4.5 billion
after 9 billion year...

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