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?
The half-life of the radioactive element unobtanium-53 is 5 seconds. If 176 grams of unobtanium-53 are initially present, how many grams are present after 5 seconds?
10 seconds? 15 seconds? 20 seconds? 25 seconds?
The amount left after 5 seconds is
grams.
The amount left after 10 seconds is
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The amount left after 15 seconds is
grams.
The amount left after 20 seconds is
grams.
The amount left after 25 seconds is grams.
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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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- A rock started with 4000 atoms of a parent radioactive isotope and now has 3750 daughter isotopes. If the half life of this isotope is 50,000 years, how old is the rock? O 200,000 O 100,000 O 3125 O 50,000 O 6250arrow_forwardCarbon-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_forwardAssume you found a radioactive isotope that has a 1 million year half-life in an "old" bone. If you were to measure a 20% "parent" to 80% "daughter" ratio, how old is the bone? How would a bone twice as big change the count rate and the half-life?arrow_forward
- If 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_forwardIf carbon-14 underwent beta decay, what is the resulting nucleus?arrow_forward
- What happens when an unstable nucleus undergoes radioactive decay?arrow_forwardCarbon-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_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_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_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_forwardCalculate the energy released in H-alpha emission of hydrogen.arrow_forward
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