A. the temperature at which the water vapor will condense
Answer:
This is my answer spot
Explanation:
I had something else on here. I don't know how to take off my own posts. Answer will be updated when I have the answer.
What percent of potassium-40 remains undecayed in a rock that is 3.9 billion years old? The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.
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