21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 8.2, Problem 8.2CYU
To determine
The amount of element A remaining after
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What is "half-life"?
Select one:
a. The time needed for half of the radioactive atoms in a sample to decay
b. the time needed for a radioactive atom to lose half its energy
c. the time needed for the mass of a radioactive atom to decrease by one-half
1. Calculate the age of the fossil given that the amount of 14C found in it is 92 percent of that in living tissue. Carbon-14 has a half life of 5730 years ?
The radioactive gas krypton-85, produced by nuclear power plants as well as volcanoes, is present in trace amounts in earth’s atmosphere. Its half-life is 10.8 years. Suppose a volcano released 250 g of krypton-85 in an eruption. How much would remain after (a) 10.8 years, (b) 15 years, and (c) 50 years? Round to the nearest tenth of a gram.
Chapter 8 Solutions
21st Century Astronomy
Ch. 8.1 - Prob. 8.1CYUCh. 8.2 - Prob. 8.2CYUCh. 8.3 - Prob. 8.3ACYUCh. 8.3 - Prob. 8.3BCYUCh. 8.4 - Prob. 8.4CYUCh. 8.5 - Prob. 8.5CYUCh. 8.6 - Prob. 8.6CYUCh. 8 - Prob. 1QPCh. 8 - Prob. 2QPCh. 8 - Prob. 3QP
Ch. 8 - Prob. 4QPCh. 8 - Prob. 5QPCh. 8 - Prob. 6QPCh. 8 - Prob. 7QPCh. 8 - Prob. 8QPCh. 8 - Prob. 9QPCh. 8 - Prob. 10QPCh. 8 - Prob. 11QPCh. 8 - Prob. 12QPCh. 8 - Prob. 13QPCh. 8 - Prob. 14QPCh. 8 - Prob. 15QPCh. 8 - Prob. 16QPCh. 8 - Prob. 17QPCh. 8 - Prob. 18QPCh. 8 - Prob. 19QPCh. 8 - Prob. 20QPCh. 8 - Prob. 21QPCh. 8 - Prob. 22QPCh. 8 - Prob. 23QPCh. 8 - Prob. 24QPCh. 8 - Prob. 25QPCh. 8 - Prob. 26QPCh. 8 - Prob. 27QPCh. 8 - Prob. 28QPCh. 8 - Prob. 29QPCh. 8 - Prob. 30QPCh. 8 - Prob. 31QPCh. 8 - Prob. 32QPCh. 8 - Prob. 33QPCh. 8 - Prob. 34QPCh. 8 - Prob. 35QPCh. 8 - Prob. 36QPCh. 8 - Prob. 37QPCh. 8 - Prob. 38QPCh. 8 - Prob. 39QPCh. 8 - Prob. 40QPCh. 8 - Prob. 41QPCh. 8 - Prob. 42QPCh. 8 - Prob. 43QPCh. 8 - Prob. 44QPCh. 8 - Prob. 45QP
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- How does the CNO cycle differ from the proton-proton chain? How is it similar?arrow_forwardWhy is the existence of “hot Jupiters” puzzling? What is the current hypothesis for how they formed?arrow_forward(20)The half-life of Carbon-14 is 5700 years. If a 16 gram sample is found in a rock layer known to be 42,000 years old, how much Carbon-14 did it start with? Group of answer choices 1400 g 3700 g 3100 g 5300 g 2600 garrow_forward
- A sample of carbon-14 has a mass of 2.0 × 10–6 g. Carbon-14 has a half-life of 6000 years. How much carbon-14 will be left after 24 000 years? How would I sovle this?arrow_forward4b) the average density of the earth is 5.5 g/cm^3. Which has the greater density 1g of uranium of planet earth 4c) which has the greater density -5kg of lead or 10kg of gold? 4d) which has the greater density-5kg of osmium of 10kg is steel? ANSWER ALL PLZ!!arrow_forward2) Uranium-238 undergoes alpha decay. Into what element does Uranium 238 transmute? What is the atomic number of the new element? 4) Technetium-99 m is a radioactive isotope with a half-life of 6 hours. If a sample of was originally 100mg , how much would remain after 24 hours? 5) How long would it take a 1-kg radioactive substance with a half-life of 100 years to decay into1 2.5 g?arrow_forward
- An isotope of a radioactive element has half-life equal to 9 thousand years. Imagine a sample that is so old that most of its radioactive atoms have decayed, leaving just 25 percent of the initial quantity of the isotope remaining. How old is the sample? Give your answer in thousands of years, correct to one decimal place.arrow_forwardA hypothetical radioactive isotope has a half life of 10 minutes. If you start with 100 grams of this isotope, after 30 minutes, how many grams will you have left of this radioactive isotope, and how many grams of its daughter isotope?arrow_forwardWhat is the difference between nuclear fission and nuclear fusion? Which one is used in our nuclear power plants?arrow_forward
- A particular radioactive material was weighed exactly 1 year ago, showing a mass of 200 g. If the mass was measured today, showing only 1.5 g remaining, calculate the half-life of the radioactive material.Please give your answer in units of days, rounded to the nearest day.arrow_forward3. What is Nuclear Fusion? 4. What is Nuclear Fission?arrow_forwardAn isotope of a radioactive element has half-life equal to 5 thousand years. Imagine a sample that is so old that most of its radioactive atoms have decayed, leaving just 20 percent of the initial quantity of the isotope remaining. How old is the sample? Give your answer in thousands of years, correct to one decimal place. Age : ___ thousand years.arrow_forward
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