Chemistry
Chemistry, 06.10.2019 20:00, BrainGeek4848

Can you give examples of bad using radioactive elements ?

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Biology, 27.06.2019 19:50, iloading5117
Sunflowers growing in pots were placed, with their roots submerged, in the pond contaminated with radioactive elements. the sunflowers kept growing; in the process, they absorbed radioactive elements. within twelve days, 85 percent of the radioactive elements were removed from the water, which is no less than can be accomplished with the much more expensive conventional filtration techniques. scientists therefore propose using sunflowers for decontamination wherever there are radioactively contaminated ponds.which of the following, if true, points to a limitation on the applicability of the proposed method of decontamination? (a) some plants other than sunflowers can also remove radioactive elements from water.(b) the water in many ponds contaminated with radioactive elements is so cold that it would kill sunflowers whose roots were submerged in it.(c) sunflowers that grow with their roots submerged in water grow less well than sunflowers growing under optimal conditions on dry land.(d) only species of sunflowers with large leaves can have their roots submerged in water and still keep growing.(e) in ponds in which the circulation of the water is artificially increased, sunflowers absorb radioactive elements far faster than they do in other ponds.
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Biology, 08.07.2019 05:00, patricklcc07777
Which statement accurately describes radioactive dating? geologists use only one type of radioactive dating. geologists compare parent and daughter elements to determine rock type. geologists measure how stable parent elements decay into daughter elements. geologists determine half-life as radioactive elements get trapped in rock and break down over time.
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Mathematics, 10.11.2019 07:31, annikafischer
35.7 half-lives of radioactive elements radioactive element element's half-life (billion years) element it decays into lutetium-176 halfnium-176 potassium-40 11.93 argon-40 rhenium-187 423 osmium-187 rubidium-87 48.8 strontium-87 thorium-232 lead-208 uranium-238 lead-206 graph it on a separate sheet of paper, draw a bar graph showing the half-lives of the radioactive elements in the chart. be sure to label your graph's x- and y-axes, and give your graph a title analyze it 1. which element has the longest half-life? the shortest? 4. can radiocarbon dating be used to date most rocks? explain why or why not. 2. which radioactive element is the source for lead-208? 5. suppose scientists used radioactive dating to determine that rocks at a dig site were 3 million years old. what would this data suggest about the age of any fossils found at the site? explain your answer. 3. how many elements in the chart have a half-life of less han 15 billion years?
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