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Be sure to answer all parts. Archaeologists can determine the age of artifacts made of wood...
Be sure to answer all parts. Archaeologists can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive isotope 14C present in the object. The amount of isotope decreases in a first-order process. If 29.3% of the original amount of 14C is present in a wooden tool at the time of analysis, what is the age of the tool? The half-life of 14C is 5,730 yr. Give your answer in scientific notation.
Archaeologists can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive isotope 14C present in the object. The amount of isotope decreases in a first-order process. If 14.1% of the original amount of 14C is present in a wooden tool at the time of analysis, what is the age of the tool? The half-life of 14C is 5,730 yr. Give your answer in scientific notation. x 10yr
Not the answer above Be sure to answer all parts 206 Determine the age of rock that contains 41.7 mg of23*U and 3.93 mg of20'Pb. of 238U 4.51 x 109 yr) (1/2 Enter your answer in scientific notation. 9 x 10 15.3 yr
Be sure to answer all parts. Determine the age of rock that contains 23.2 mg of 238 U and 2.29 mg of 206 Pb. (t 12 of 238 U 4.51 x 109 yr). Enter your answer in scientific notation. x10 yr
Be sure to answer all parts of the question: a. A fabric remnant from a burial site has a 14C/12C ratio of 0.655 of the original value. How old is the fabric? ____ yr b. If 5.01 × 10−9 mol of 176W emits 1.07 × 1015 β+ in 1.00 h, what is the decay constant? Enter your answer in scientific notation. ____ × 10___ h−1
Be sure to answer all parts. The carbon-14 decay rate of a sample obtained from a young tree is 0.264 disintegration per second per gram of the sample. Another wood sample prepared from an object recovered at an archaeological excavation gives a decay rate of 0.193 disintegration per second per gram of the sample. What is the age of the object? (The half-life of carbon-14 is 5715 years.) × 1 ol 1 years Enter your answer in scientific notation.
Be sure to answer all parts. Cobalt-60 is a radioactive isotope used to treat cancers of the brain and other tissues. A gamma ray emitted by an atom of this isotope has an energy of 0.300 MeV (million electron volts; 1 eV 1.602 x 1019 J). What is the frequency (in Hz) and the wavelength (in m) of this gamma ray? Enter your answers in scientific notation. Frequency: х 10 Hz Wavelength: х 10 m
Be sure to answer all parts. The radioactive decay of thallium−206 to lead−206 has a half-life of 4.20 min. Starting with 5.50 × 1022 atoms of thallium−206, calculate the number of such atoms left after 42.0 min. Enter your answer in scientific notation. × 10 atoms
Be sure to answer all parts. An electron microscope focuses electrons through magnetic lenses to observe objects at higheir magnification than is possible with a light microscope. For any microscope, the smallest object that can be observed is one-half the wavelength of the radiation used. Thus, for example, the smallest object that can be observed with light of 400.0 nm is 2.00 x 10m (a) What is the smallest object observable with an electron microscope using electrons moving at 3.70...
My Notes Ast our Teacher Scientist can determine the age of andient objects by a method called radiocarbon dating. The bombardment of the upper atmosphere by cosmic rays converts nitrogen to a radioactive isotope of carbon, 1C, with a haf-ife of about 5730 years. Vegetation absorbs carbon dioxide through the atmosphere and animal life assimilates through food chains. When a plant or animal dies, t stops replacing its carbon and the amount of1C begins to decrease through radioactive decay. Therefore,...