Biology

Biology, 26.07.2019 23:00, samarkanduzbek

What will be the percentage of potassium-40 remaining after 3.9 billion years? also gets !

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Chemistry, 21.07.2019 18:30, janeou17xn

Potassium-40 has a half-life of 1.3 billion years. as the potassium-40 isotope decays, it becomes argon. if a rock was formed with 12 g of potassium-40, approximately how long would it take for 75% of the potassium-40 to be replaced by argon? a. 1.3 billion years b. 2.6 billion years c. 5.2 billion years d. 650 million years

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Chemistry, 28.07.2019 23:10, scottbrandon653

Arock has 50 percent of its original amount of potassium-40 remaining in it. potassium-40 has a half-life of 1.25 billion years. how long ago was the rock formed? 1.25 billion years ago 2.50 billion years ago 5.00 billion years ago 6.25 billion years ago

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Business, 10.10.2019 18:30, colin774

Which statement explains what geologists can learn from the graph? they can estimate that all the potassium will have decayed within 6.5 billion years. they can tell that 1/8 of the argon gas will be left after 3.9 billion years. they can determine that a rock is 1.3 billion years old if 1/2 of the potassium has decayed. they can see that potassium’s half-life varies from every 1.3 billion years to every 5.2 billion years.

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Chemistry, 03.11.2019 06:31, Boris1002

Arock has 12.5 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion years. how long ago was the rock formed? a. 1.25 billion years ago b. 2.5 billion years ago c. 3.75 billion years ago d. 5 billion years ago

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