Physics (5th Edition)
5th Edition
ISBN: 9780134051802
Author: Walker
Publisher: PEARSON
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Chapter 32, Problem 39PCE
To determine
The age of the bones of a saber-toothed tiger that are found to have an
12.5 %
activity per gram of carbon.
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In 1991, two hikers in the Alps, between Italy and Austria,
discovered the remains of a well-preserved mummy that dates back to the Ice Age.
The activity of C-14 in the remains of the Iceman was measured to be 0.1220 Bq per gram.
In a living organism the rate of radioactive decay of C-14 is 0.2310 Bq per gram.
Determine how long ago the Iceman lived.
The half-life of C-14 is 5730 years.
(in yr)
OA: 1732 OB: 2511 OC: 3641 OD: 5280 OE: 7655 OF: 11100 OG: 16095 OH: 23338
Monique, an archaeologist from UWC finds an ancient wooden axe handle at an excavation site at Onderstepoort. She wants to determine the age of the axe handle. She takes a small sample of carbon from the axe handle and places it near a Geiger counter. The counter reads 20 counts/minute. She then takes the same mass of carbon from a living tree and finds that it has a count-rate of 40 counts/minute. a) How old is the axe handle? (assume the half-life of C-14 is about 6000 years) - choose answer below b) Explain your reasoning in 'Rationale'
Sihle, an archaeologist from UWC finds an ancient wooden axe handle at an excavation site at Onderstepoort. He wants to determine the age of the axe handle. He takes a small sample of carbon from the axe handle and places it near a Geiger counter. The counter reads 5 counts/minute. He then takes the same mass of carbon from a living tree and finds that it has a count-rate of 40 counts/minute. a) How old is the axe handle? (assume the half-life of C-14 is about 6000 years) - choose answer below b) Explain your reasoning in 'Rationale'
A. 6000 years
B. 2000 years
C. 18 000 years
D. 12 000 years
Chapter 32 Solutions
Physics (5th Edition)
Ch. 32.1 - Prob. 1EYUCh. 32.2 - A given nucleus can decay by alpha decay, beta...Ch. 32.3 - Prob. 3EYUCh. 32.4 - Prob. 4EYUCh. 32.5 - Prob. 5EYUCh. 32.6 - Prob. 6EYUCh. 32.7 - Prob. 7EYUCh. 32.8 - Prob. 8EYUCh. 32.9 - Prob. 9EYUCh. 32 - Prob. 1CQ
Ch. 32 - Prob. 2CQCh. 32 - Prob. 3CQCh. 32 - Prob. 4CQCh. 32 - Prob. 5CQCh. 32 - Prob. 6CQCh. 32 - Prob. 7CQCh. 32 - Prob. 8CQCh. 32 - Prob. 9CQCh. 32 - Prob. 1PCECh. 32 - Prob. 2PCECh. 32 - Prob. 3PCECh. 32 - Prob. 4PCECh. 32 - Prob. 5PCECh. 32 - Prob. 6PCECh. 32 - Prob. 7PCECh. 32 - Prob. 8PCECh. 32 - Prob. 9PCECh. 32 - Prob. 10PCECh. 32 - Prob. 11PCECh. 32 - Prob. 12PCECh. 32 - Prob. 13PCECh. 32 - Prob. 14PCECh. 32 - Prob. 15PCECh. 32 - Prob. 16PCECh. 32 - Prob. 17PCECh. 32 - Prob. 18PCECh. 32 - Prob. 19PCECh. 32 - Prob. 20PCECh. 32 - Prob. 21PCECh. 32 - Prob. 22PCECh. 32 - Prob. 23PCECh. 32 - Prob. 24PCECh. 32 - Prob. 25PCECh. 32 - Prob. 26PCECh. 32 - Prob. 27PCECh. 32 - Prob. 28PCECh. 32 - Suppose we were to discover that the ratio of...Ch. 32 - A radioactive sample is placed in a closed...Ch. 32 - Radon gas has a half-life of 3.82 d. What is the...Ch. 32 - Prob. 32PCECh. 32 - The number of radioactive nuclei in a particular...Ch. 32 - Prob. 34PCECh. 32 - Prob. 35PCECh. 32 - Prob. 36PCECh. 32 - Prob. 37PCECh. 32 - Prob. 38PCECh. 32 - Prob. 39PCECh. 32 - Prob. 40PCECh. 32 - Prob. 41PCECh. 32 - Prob. 42PCECh. 32 - Prob. 43PCECh. 32 - Prob. 44PCECh. 32 - Prob. 45PCECh. 32 - Prob. 46PCECh. 32 - Prob. 47PCECh. 32 - Prob. 48PCECh. 32 - Prob. 49PCECh. 32 - Prob. 50PCECh. 32 - Prob. 51PCECh. 32 - Prob. 52PCECh. 32 - Prob. 53PCECh. 32 - Prob. 54PCECh. 32 - Prob. 55PCECh. 32 - Consider a fusion reaction in which two deuterium...Ch. 32 - Prob. 57PCECh. 32 - Prob. 58PCECh. 32 - Prob. 59PCECh. 32 - Prob. 60PCECh. 32 - Prob. 61PCECh. 32 - Prob. 62PCECh. 32 - Prob. 63PCECh. 32 - Prob. 64PCECh. 32 - Prob. 65PCECh. 32 - Prob. 66PCECh. 32 - Prob. 67PCECh. 32 - Prob. 68GPCh. 32 - Prob. 69GPCh. 32 - Prob. 70GPCh. 32 - Prob. 71GPCh. 32 - Prob. 72GPCh. 32 - Prob. 73GPCh. 32 - Moon Rocks In one of the rocks brought back from...Ch. 32 - Prob. 75GPCh. 32 - Prob. 76GPCh. 32 - Prob. 77GPCh. 32 - Prob. 78GPCh. 32 - Prob. 79GPCh. 32 - Prob. 80GPCh. 32 - Prob. 81GPCh. 32 - Prob. 82GPCh. 32 - Prob. 83GPCh. 32 - Prob. 84GPCh. 32 - Prob. 85GPCh. 32 - Prob. 86GPCh. 32 - Prob. 87GPCh. 32 - Prob. 88GPCh. 32 - Prob. 89PPCh. 32 - Prob. 90PPCh. 32 - Prob. 91PP
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- Data from the appendices and the periodic table may be needed for these problems. Show that the activity of the 14C in 1.00 g of 12C found in living tissue is 0.250 Bq.arrow_forwardCalculate the dose in Sv to the chest at a patient given an xray under the following conditions. The xray beam intensity is 1.50 W/m2, the area of the chest exposed is 0.0750 m2 35.0% of the xrays are absorbed in 20.0 kg of tissue, and the exposure time is 0.250 s.arrow_forwardIf a 1.50cmthick piece of lead can absorb 90.0% of the rays from a radioactive source, how many centimeters of lead are needed to absorb all but 0.100% of the rays?arrow_forward
- While exploring a coal mine, scientists found plant fossils which had been preserved by an earthquake in the ceiling of the mine Samples taken from one of the fossils had carbon14 activities of 40.0 counts/min. A reference sample of the same size from a plant alive today has a carbon-14 activity of 160.0 counts/min. If carbon-14 has a half-life of 5730 years , what is the age of the plant fossil in years?arrow_forwardA sample of radioactive material is obtained from a very old rock. The activity of the rock over a period of time is monitored, and lnA is plotted as a function of t such as in Figure (b). The slope of the line has a value of -6.1 ×10^−8y^−1. FInd the half-life in years.arrow_forwardCopper-63 has a nucleus mass of 62.92959 u. Its atomic number is 29, and its atomic mass number is 63. The mass of a proton is 1.007276 u and the mass of a neutron is 1.008664 u What is the total binding energy of the nucleus? Express your answer in MeV and keep 4 significant digits.arrow_forward
- The charred bones of a sloth in a cave in Chile represent the earliest evidence of human presence at the southern tip of South America. A sample of the bone has a specific activity of 5.22 disintegrations per minute per gram of carbon (d/min*g). If the 12Cy14C ratio for living organisms results in a specific activity of 15.3 d/min*g, how old are the bones (t1/2 of 14C = 5730 yr)?arrow_forwardA piece of charcoal used for cooking is found at the remains of an ancient campsite. A 1.00-kg sample of carbon from the wood has an activity equal to 5.00 x 102 decays per minute. Find the age of the charcoal. Hint: Living material has an activity equal to 15.0 decays/min per gram of carbon present.arrow_forwarda sample containing l-131 has an activity of 6.4x10^8 Bq.h how many days later will the sample have an activity of 6.2x10^6 Bq? the half life of l-131 is 8.0252 daysarrow_forward
- You find a 37.2 g fossilized bone that has an activity of 0.024 counts per second. How old is the bone? Please give your answer in years.arrow_forwardA piece of charcoal used for cooking is found at the remains of an ancient campsite. A 1.00-kg sample of carbon from the wood has an activity equal to 5.00 x 10² decays per min ute. Find the age of the charcoal. Hint: Living material has an activity equal to 15.0 decays/min per gram of carbon present.arrow_forwardA scientist is studying a 2.234 g sample of thorium-229 (t1/2 = 7340 yrs) in a laboratory. (a) What is its activity in Bq? Answer: x 10^ Bq (b) What is its activity in Ci? Answer: x 10^ Ciarrow_forward
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