As potassium-40 decays, it becomes argon-40, as shown in the…

As potassium-40 decays, it becomes argon-40, as shown in the following graph. Public Domain Potassium-40 has a half-life of approximately 1.25 billion years. Approximately how many years will pass before a sample of potassium-40 contains one-eighth the original amount of parent isotope? (2 points)

The following table shows the currently accepted half-life v…

The following table shows the currently accepted half-life values for six parent isotopes. Parent Isotope Currently Accepted Half-Life Values Uranium-238 4.5 billion years Uranium-235 704 million years Thorium-232 14.0 billion years Rubidium-87 48.8 billion years Potassium-40 1.25 billion years Samarium-147 106 billion years Earth is approximately 4.5 billion years old. Given this information and the data in the table, which isotope—if present at Earth’s creation—would currently be approaching its fourth half-life? (2 points)

As potassium-40 decays, it becomes argon-40, as shown in the…

As potassium-40 decays, it becomes argon-40, as shown in the following graph. Public Domain Potassium-40 has a half-life of approximately 1.25 billion years. Approximately how many years will pass before a sample of potassium-40 contains one-sixteenth the original amount of parent isotope? (2 points)