The cloth shroud from around a mummy is found to have a 14C14C activity of 8.7 disintegrations per minute per gram of carbon as compared with living organisms that undergo 16.3 disintegrations per minute per gram of carbon.   From the half-life for 14C14C decay, 5715 yryr, calculate the age of the shroud. Express your answer using two significant figures

The table below shows the radioactive decay of a 600 g sample of Iodine-125. % of Parent Isotope Remaining Time Half- Fraction of Parent (days) Lives Isotope Remaining Mass (g) of Parent Mass (g) of Daughter Isotope Isotope 100% 1/1 600 60 1 50% 1/2 120 300 300 25% 1/4 150 450 180 3 12.5% 1/8 75 525 240 4 6.25% 1/16 37.5 562.5 300 3.125% 1/32 18.75 581.25 360 1.56% 1/64 9.4 590.6 15. What percent of iodine is left if 5 half-lives have passed? 16. What percent of iodine-125 has decayed if there are 37.5 grams of the original sample left? 17. What is the half-life of Iodine-125? 18. What mass of the Iodine-125 has decayed after 6 half-lives? 19. What fraction of the Iodine-125 remains after 300 days have passed? 20. How many half-lives would have to pass for there to be only 1.2 grams remaining? 21.How many grams of the daughter isotope are there after three half-lives?

Stonehenge is an ancient megalithic site in southern England. Some believe it was designed to make astronomical observations, but archaeologists cannot agree on the reason that Stonehenge was constructed. Charcoal samples taken from a series of holes at Stonehenge have about 0.33 pounds of carbon-14 in a 06 pound sample. Estimate the age of the charcoal pits at Stonehenge Assume that the half-life of carbon-14 is 8333 years.

Pd-100 has a half-life of 3.6 days. If one had 6.02x10^23 atoms at the start, how many atoms would be present after 20.0days?

If a tree dies and the trunk remains undisturbed for 1.635 × 10⁴ years, what percentage of the original ¹⁴C is still present? (The half-life of ¹⁴C is 5730 years.)

A bone has a carbon-14 decay rate of 4.98 disintegrations per minute per gram of carbon. If a living organism has a decay rate of 15.3 disintegrations per minute per gram of carbon, how old is the bone? The half life of carbon-14 is 5715 years.

Three radioisotopes X, Y, and Z have half-lives of 1, 2 and 5 years respectively. Each of the three radioisotopes has the same activity now in July 2020. Which radioisotope will be hotter (meaning it will have more activity remaining) if you were to examine them at different times in the future, specifically in July 2023 for X, July 2024 for Y, and July 2040 for Z? Provide a full explanation of your reasoning. O Y because 2 half-lives will have passed by July 2024. OX because July 2023 is sooner than July 2024 or July 2040. OX because 3 half-lives will have passed by July 2023. O Z because July 2023 is sooner than July 2024 or July 2040. Z because July 2040 is later than July 2023 and July 2024. O Y because July 2023 is sooner than July 2024 or July 2040. O Z because 4 half-lives will have passed by July 2040.