Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 6, Problem 7QAP
To determine
The amount of decay for element A after 40 seconds.
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A 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?
A certain radioactive isotope has a half-life of 55 days. About how long would you have to wait before 1/10001/1000 of an initial sample of this isotope remained?
20 days
40 days
50 days
100 days
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Assume the half life of some radioactive element is 100 years. After 300 years have
gone by, how much of the original radioactive element is left?
1/2
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1/16
Chapter 6 Solutions
Understanding Our Universe
Ch. 6.1 - Prob. 6.1CYUCh. 6.2 - Prob. 6.2CYUCh. 6.3 - Prob. 6.3CYUCh. 6.4 - Prob. 6.4CYUCh. 6.5 - Prob. 6.5CYUCh. 6 - Prob. 1QAPCh. 6 - Prob. 2QAPCh. 6 - Prob. 3QAPCh. 6 - Prob. 4QAPCh. 6 - Prob. 5QAP
Ch. 6 - Prob. 6QAPCh. 6 - Prob. 7QAPCh. 6 - Prob. 8QAPCh. 6 - Prob. 9QAPCh. 6 - Prob. 10QAPCh. 6 - Prob. 11QAPCh. 6 - Prob. 12QAPCh. 6 - Prob. 13QAPCh. 6 - Prob. 14QAPCh. 6 - Prob. 15QAPCh. 6 - Prob. 16QAPCh. 6 - Prob. 17QAPCh. 6 - Prob. 18QAPCh. 6 - Prob. 19QAPCh. 6 - Prob. 20QAPCh. 6 - Prob. 21QAPCh. 6 - Prob. 22QAPCh. 6 - Prob. 23QAPCh. 6 - Prob. 24QAPCh. 6 - Prob. 25QAPCh. 6 - Prob. 26QAPCh. 6 - Prob. 27QAPCh. 6 - Prob. 28QAPCh. 6 - Prob. 29QAPCh. 6 - Prob. 30QAPCh. 6 - Prob. 31QAPCh. 6 - Prob. 32QAPCh. 6 - Prob. 33QAPCh. 6 - Prob. 34QAPCh. 6 - Prob. 35QAPCh. 6 - Prob. 36QAPCh. 6 - Prob. 37QAPCh. 6 - Prob. 38QAPCh. 6 - Prob. 39QAPCh. 6 - Prob. 40QAPCh. 6 - Prob. 41QAPCh. 6 - Prob. 42QAPCh. 6 - Prob. 43QAPCh. 6 - Prob. 44QAPCh. 6 - Prob. 45QAP
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- Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the 14C14C has decayed to 1/4.00 of the original amount. How long ago was this plant alive?arrow_forwardIf he sample of radioactive isotope has a half-life of one decade how much of the original sample will be left at the end of second decade? at the end of a third decade? at the end of the fourth decade?arrow_forwardWhat could happen if there is no nucleosynthesis and nuclear fusion ? What could happen if there is no light elements formed.arrow_forward
- Carbon-14 is radioactive while Carbon-12 is stable. In your body, the ratio of C-14 to C-12 is for every 10,000 C-14 atoms, there are 1 trillion (1,000,000,000,000) C-12 atoms. This is the normal ratio for livings things. In a piece of a sabre-tooth tiger bone, a scientist finds there are only 625 C-14 atoms for every 1 trillion C-12 atoms.How old is the sabre-tooth tiger bone? The half-life for Carbon-14 is 5730 years.arrow_forwardIf carbon-14 underwent beta decay, what is the resulting nucleus?arrow_forwardWhat happens when an unstable nucleus undergoes radioactive decay?arrow_forward
- A radioisotope has a half-life of τ at a temperature of 150 K. If its temperature is increased to 300 K, what will its half-life be? A) 4τ B) 2 τ C) τ D) τ/2 E) τ/4arrow_forwardThe carbon content of living trees includes a small proportion of C-14, which is a radioactive isotope. After a tree dies, the proportion of C-14 in it decreases due to radioactive decay.Suggest why the method of carbon dating is likely to be unreliable if a sample is:a) < 200 years oldb) > 60,000 years oldarrow_forwardPlutonium has a half-life of 80 million years. How long will it take for a sample of plutonium to reach 1% of its initial level?arrow_forward
- Calculate the energy released in H-alpha emission of hydrogen.arrow_forwardSuppose that instead of using half-life to characterize the radioactivity of elements, we used the idea of third-life (that is, the time it takes for one-third of a sample to decay). If the half-life of Uranium 235 is 700 million years, what would its third-life be?arrow_forwardA certain radioactive element has a half life of 3725 years. How much of a 8.03 g sample is left after 2035 years? Answer: What is the energy released when 0.520 g are converted to energy? Express your answer in joules. For self-consistent units you must use kg because 1 J-1 kg m²/s².arrow_forward
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