Question

63) Predict the mode(s) of decay of the following nucleotides: (a) Neon-24

(b) Potassium-38

(c) Titanium-45

(d) Neptunium- 237

64) Archeologists continue to debate the arrival of the first humans in the Western Hemisphere. Radiocarbon dating of charcoal form a cave in Chile was used to establish the earliest date of human habitation in South America ad 8700 years ago. What fraction of the Carbon-14 initally present remained in the Charcoal after 8700 years?

65) A giant sequoia tree was cut down in 1891 in what is now Kings Canyon National Park. It contained 1342 annual growth rings. If samples of the tree were removed for radiocarbon dating today, what would be the difference in carbon-14/carbon-12 ratio in the innermost (oldest) ring compared with that ratio in the youngest ring?

Please complete each question. Thank you!